AITA Found out mid-dinner that the guy we were with had slept with my GF

He walked into the dinner party carrying a quiet unease, aware of the delicate threads holding his relationship together. His girlfriend had always been open about her past, or so he believed, but a careless comment from a stranger shattered the fragile trust he clung to. The revelation that her history was far more tangled than she let on struck him like a cold wave, stirring a storm of betrayal and confusion inside his chest.

In the aftermath, raw emotions spilled over—anger, hurt, and a profound sense of being deceived in front of others. Yet beneath the surface, a complicated truth emerged: honesty, even when delayed, had the power to soften the blow. As they talked through the pain and the lies, he found himself strangely lighter, the weight of unknowns lifting just enough to glimpse a fragile hope for healing.

AITA Found out mid-dinner that the guy we were with had slept with my GF

My GF (39F) invited me (M42) to go to a dinner party at her friend’s house last night. I knew they had met on a dating app and she had said they went on one date but decided to be friends instead.

They hang out from time to time and I had met him once before about a year ago right after we started dating. I have no reason to believe anything is going on right now but this is not the only ex she hangs out with.

During the party, one of the other guests made a comment that made it apparent that it was more than one date and that things had gone much further than she said.

I laughed it off in the moment but asked her about it when we left and she admitted how far it had gone. I sort of blew up (my clear asshole moment) because I felt that she could have been honest and the fact that she wasn’t made me look like an idiot in public.

We spoke about it today and I apologized and she explained why she had lied about it. I don’t know why but now that I know the truth I sort of feel less comfortable with them hanging out.

I know I’m the asshole for blowing up but am I the asshole for sort of thinking she should cut ties with this guy now?

Here’s how people reacted:

atmasabr

>I know I’m the asshole for blowing up but am I the asshole for sort of thinking she should cut ties with this guy now?

NTA and I see it exactly the opposite. I assume by “blowing up” you must mean you argue dirty, but you have not made that part clear.

But I think your impulse for her to cut ties, while perhaps coming from a healthy place of caution, is misplaced. You met the guy already without incident. That’s about the most mature way to exercise vigilance. So you have reason to think something was mismatched. True, you should do something else about it. But I think that something else should be you level with the ex that you were left in the dark, and see his reaction. Well at least that’s something someone closer to sainthood would do.

Meep42

ESH

Agree on the reasons you have for you being TAH, as well as you thinking she should cut ties. That’s a bit controlling.

But she is also TAH for misleading you about her former relationship with her friend.

Now, if she feels that she couldn’t tell you the reality of this and possibly her other friends/“ex’s” that is also something to consider…since most relationships truly rely on trust and clear/true communication. And there isn’t either here.

Ill-Public797

Brother, I mean this in every way possible…..dump her and run for the hills.
She’s still screwing him or is contemplating on it. At the very least that particular chapter between them is still partially open.
The fact she lied to you about how far they went means she wants to be sure you are never suspicious enough of their friendship to ever watch for signs of foul play between them.
Protect your sanity and distance yourself.
Realistic_Flower_814

This is 2024, of course she has gone further with some of her ex’s. That doesn’t mean she can’t be friends with them. That also doesn’t mean she has to disclose every detail of her previous relationships to you.
That stuff is in the past and not important.
What is important is that your current relationship with her is good and that she isn’t cheating, which it sounds like she isn’t from the post.
Sure-Beach-9560

INFO:
Was this a friends with benefits situation or a one night stand that then decided to just be friends?

Because if it’s the first, that’s a serious breach of trust and you should probably consider the future of the relationship.

If it’s the second, I think you’re overreacting a bit. Plus, there is zero reason to worry because they’re obviously not sexually compatible.

FiFi_Green

I’m not a fan of disclosing past sexual history with partners with one major exception: I never want to be the only person in the room who doesn’t know my partner slept with another person in the room. It’s unnecessarily humiliating. NTA, also who was TA who made a comment that made it clear the relationship had gone further? Classless.
RoyGBIV45

NTAH, you gave her a chance to be honest and she downplayed it because she likely knew if she told you how far they had gotten you maybe wouldn’t have been comfortable with them continuing contact. You may feel like an asshole but that is a reasonable response to being lied to and feeling publicly embarrassed about the situation.
FluffBuffer23

I do not believe a woman can’t have male friends. I DO believe a lie about sleeping with one such friend is very hard to forgive.

Maybe this is just how you framed tgis, but the fact you *apologized* to her for your outburst while she *explained* to you without apologizing why it was actually totally fine hits my ear very wrong.

Tastes_Like_TRex

Blowing up is never good, but lying is always bad. You need to make up for any hurt you caused when you blew up, then reevaluate your boundaries.

I, personally, wouldn’t have a problem hanging out with exes that were friends unless I’d been lied to. I think changing your attitude after the lie is perfectly reasonable.

buckem420

YTA, people need to understand that you can sleep with someone and decide you have no interest in ever doing it again while still being friends with them. She likely didn’t tell you the truth about that because of how weird men sometimes get about it, doing things like telling them they need to cut ties with them.
TaiwanBandit

Now you know she is not hesitant to lie. That will always be in the back of your mind while you are with her.

I will say NTA, but maybe work at controlling initial reactions to situations.

Suggest you move on from her as there is probably a lot more about her you don’t know and may not want to know.

Embarrassed_Leg7201

I don’t think you are the arsehole for blowing up at her, she lied to you about the relationship and continues to see him, so I’d be very suspicious of why she didn’t tell you when it first came up a year ago. For myself I’d break up with her because quite frankly I wouldn’t trust her anymore.
the_lilyblooms

t’s normal to want transparency and trust in a relationship. Your reaction makes sense since she wasn’t fully honest upfront, which can hurt trust. It’s fair to calmly share how this has affected you and discuss boundaries moving forward. Just keep communication open so you both feel secure.
FirstDevelopment3595

Her lying about their relationship and then continuing to see him while with you are 2 red flags. She stole your agency about deciding if you should have a relationship with her. Maybe you would have maybe you wouldn’t but you never got that choice. You know what you should do now. Move on.
L8_Apexx

Probably that’s the exact reason she didn’t provide all the details. She knew you are insecure and won’t able to handle it. Ans you proved it right.
Grow up, it was past and it’s gone. You don’t need to know every damn details. Focus on present and you will not have to worry about anything
anonanon-do-do-do

Info – how long ago was this? Frankly I have probably hung out with several of my Wife’s friends she dated/slept with before we were married.  We are adults.  She once attended a wedding where a long term ex was in the wedding party.  I asked if it bothered her.  She said ‘why?  I won!’
jrat68

She lied to you for your entire relationship and you think you’re the AH for blowing up about it.

Quit being such a weak ass doormat. She should be apologizing to you and doing whatever it takes to keep you.

Now ask yourself this, what else has she lied about and hidden from you.

sorearm

She lied about the extent of their relationship, red flag, and continues to meet up, another red flag.
He will be looking for any opportunity to bed her and she probably still has the tingles for him.
Time to go grey rock and start to end the relationship.
Arinacutiiee

Focus on expressing your feelings without making demands. Rather than demanding she cut ties, have a conversation about how both of you can feel comfortable with her friendships. It’s a shared decision that should involve both of your feelings.
hotmilkynuts

While your reaction may have been an overreaction, it’s understandable to feel uncomfortable about your girlfriend’s friendship with someone she has a romantic history with, and wanting her to reassess that connection isn’t inherently wrong.
Ok_Historian_646

NTA! NTA for blowing up (she lied) and NTA for setting boundaries! She created this mess and OP reacted. At this point it is obvious that your GF cannot be trusted and I wonder if there is more going on with her and these exes.
phred0095

She lied to you. She got caught. And you apologized.

Do you have so little self-esteem that you’d rather apologize to someone who’s screwing you over then stand up for yourself?

You are not in a good place.

stiggley

NTA she wasn’t honest about their relationship because you would be uncomfortable. So she knew it was an issue and deliberately, and repeatedly lied about it. No trust.
headwaterscomponent1

You found out at dinner that your girlfriend’s ‘friend’ is more like a ‘friend with benefits’? Sounds like the plot twist of a rom-com gone wrong
justthoughtidcheck

It’s time for you to look for someone else. Move on from this woman because she will sleep around on you if she’s not already doing so
wasicwitch

NTA, cmon. Why are people so insistent on hanging out with folsk they used to f while they are in a relationship with someone else?
loicji91

dude she lied to you and she should have cut contact, but she chose purposely to fool you, that alone is worth dump her ass OP…
AuggieNorth

You apologized? Come on dude. Grow a pair. She lied and made you look like a simp. You have plenty of reason to be upset. NTA
Some_Badger_2950

NTA she lied. You should be done with her. The fact she hangs out with other exs is not good. What else is she lying about?
kingjohnbigboote

Always remember. She didn’t come clean because she wanted to. She only admitted to the lie because she got caught.

NTA

Business_Respond_189

She is a liar, she lied because she is a liar. She also lied about the guy because, you guessed it, she is a liar.
lilaloluuuuu

Don’t let her make you feel like you’re the problem and focus on what matters: she lied to you! She’s the AH.
MammothHistorical559

Why does she have to disclose anything? Be an adult OP, at ago 40 and up there’s bound to be history.
Gohighsweetcherry

There’s a reason why one of the other guests made that comment with you there.
Open your eyes.
ImaginaryScallion371

She still wants him in her life, because she still wants him.

You are just a place holder.

BlkBrnerAcc

Youre not the asshole stop letting these thots gaslight you
Anxious_Panda_2179

At your age you should not be asking for advice! Grow up
PandaPo0

Break up and try learn from your mistake.

Conclusion

The original poster (OP) is grappling with feelings of betrayal and insecurity after learning his girlfriend omitted significant details about a past relationship. His emotional outburst stemmed from feeling publicly embarrassed and deceived, leading to an apology for his reaction. Now, the core conflict is the OP’s discomfort with his girlfriend maintaining a friendship with this man versus his acceptance of her explanation for the initial dishonesty.

Given the breach of trust caused by the withholding of information, should the OP’s current desire for his girlfriend to end contact with this specific male friend be respected as a necessary boundary for the stability of their relationship, or is demanding separation an unfair imposition on her established friendships?

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