AITA for moving into a studio apartment away from my mother-in-law who moved in?

Beneath the fragile walls of a shared apartment, a silent storm brews—a mother’s struggle to protect her son battling addiction, a couple caught in the crossfire of shattered trust and painful sacrifices. The weight of harsh realities presses down, revealing how love can sometimes demand impossible choices to save what little hope remains.

Yet, in the fragile quest for healing, promises are broken and old patterns creep back, igniting a profound betrayal. The laughter that once symbolized unity now echoes with the sting of broken boundaries, threatening to unravel the delicate balance between compassion and self-preservation.

AITA for moving into a studio apartment away from my mother-in-law who moved in?

Long story short, my boyfriend’s mom is poor and had to move in to my boyfriend and I’s apartment last month because my boyfriend’s brother (who lived with her) got them both evicted.

He stole her car and wrecked it into their apartment and almost killed someone. He’s currently in rehab and before she moved in, I sat down with my boyfriend and I laid out the requirements of her living here: she must cut off contact with his brother for his own good and never invite him over, as I’m afraid of him retaliating at our apartment and getting us evicted too, and she should stop enabling him with a constant safety net to continue his drug use (I know that sounds harsh but it was the only way to actually force him to get help, this has been an almost decade-long battle of her enabling him and he’s not getting any better).

My boyfriend agreed to this and she agreed. Cut to two weeks in, I come home from work. My boyfriend and her are laughing about how they took his brother to Golden Corral when I was gone and he was so high he was nodding off in the food.

I was so upset that not only did she break the cardinal rule that I set for her but that my boyfriend went along with it and did it too. I told him I felt betrayed and that he just set a precedent to her that she can do whatever she wants now because any rule set isn’t actually going to be enforced, clearly by his example.

He told me he did it because he thought it was too harsh after the fact without telling me he had changed his mind, and thereby going against our agreement. I otherwise wouldn’t have let her live here rent-free.

My boyfriend said putting her on the street was too harsh of a punishment for breaking the rules, but isn’t that the point? Now she’s telling us we need to do HER chores when we pay the rent, because she doesn’t want to do them, knowing he won’t enforce or kick her out because he ultimately can’t face the guilt of doing so.

He has attachment issues with her and a heavy guilt complex.

Our apartment lease is up in a couple months and now that we’re moving, she asked us “So where are WE moving to?” fully expecting a free-ride and free rent at our next place. I was so dumbfounded because she is only supposed to be here until she got housing, but low income housing waiting lists can be months to years long.

I don’t want to live with her anymore because she walks all over us and causes tension between my boyfriend and I. He will never put her on the street because he’s controlled by his guilt.

When I asked what he plans to do, he said he isn’t taking her to our next place, but that would ultimately leave her on the street and I know deep down even if we initially move without her, she will be back in a week or two because he’ll feel guilty.

I want to move into a studio apartment now knowing that I don’t believe he’s going to let her go, and I’ve voiced this as a real possibility to him, but I’m being framed as trying to dismantle our relationship.

AITA?

Here’s how people reacted:

froggylove78

Ask yourseld these questions, and if the answer is NO to any of them, you know what to do:

Is this the life you want for yourself? Will you be happy if the situation continues? Will you be okay when his brother moves? Will you be afraid of being evicted if he does move in?

He has shown you that he is okay with breaking your boundaries but not enforcing boundaries for his family. Do you want to continue to enable the situation?

He has shown you who he is, believe him. If you need permission, I will give it to you. Don’t set yourself on fire to keep him warm. He is the victim of his problem.

Asleep_Loquat8722

Girl, you got more than one issue – he’s a mama’s boy, his mom moved in and they both enable the brother/son who is a serious drug addict. CUT YOUR LOSSES. You aren’t married to him and hopefully do not have kids with him. DUMP HIM and don’t let them contact you again. These are not your issues to deal with, let them deal with the consequences and move on.
WabbitCZEN

NTA. When someone shows you who they really are, believe them. This is a preview of the life you’ll have if you stay with him. His mother knows she can take advantage of him, she knows he won’t tell her no, and she knows any rule you set he will let her break. Run fast, run far, cut bait at the first opportunity and do not look back.
TheRealRedParadox

NTA double down on your moving plans any time he says your destroying the relationship, throw it back in his face. Every. Time. This wouldn’t have happened if he hadn’t went behind your back. This wouldn’t have happened if he broke your trust and violated your space. This wouldn’t have happened if he had a God damn spine. 
Last_Rise_3108

NTA, you made it clear what your boundaries were and they were broken by the mother and your boyfriend. Addiction is a disease, unfortunately they have to let the person hit absolute rock bottom and hope the brother will want help (ie rehab) but it seems like they aren’t and they will continue to cross your boundaries.
National_Pension_110

You can’t really dictate how a mother and brother will treat their family member but it was fine to try. NTA for moving out and you need to just move on. This has zero chance of a happy ending I’m afraid. You gave it a shot but they are set in this cycle. You are not their savior.
Human-Negotiation-30

Honestly, it is better to break it off now because if simple boundaries can not be respected and enforced, you will be stuck in a cycle of nothing getting resolved. Plus, better to have your own place and let your boyfriend deal with his mother himself.
TransportationNo5560

NTA- Tell him that he “dismantled” the relationship when you became the side piece in a relationship of three. Find your own place and DO NOT tell him where it is because they will show up on your doorstep because they haven’t found a place.
Main_Direction6963

I don’t want to sound really cruel here, but brother is a loser, mom is a loser and boyfriend is a loser. The only difference between the three of them is one of them is high. All 3 are codependent.
Get.

Out.

Now.

SeniorAd5565

NTA, enjoy your new studio apartment and consider being single while you’re at it. Nothing good comes from being with a family of enablers I can tell you that first hand.
salukiqueen

Girl. Re-read your post please. You are OBVIOUSLY not the AH. But you will be to yourself if you move with him. Get your own place and let him date his mother in peace.
Quirky-Chick1968

NTA, but you will never be rid of her. He is a momma’s boy. Move out now to your own apartment and say goodbye to this mess! Your mental health will thank you!
applechicmac

move to your own location. you will never be free of his mother and brother. you should probably end the relationship on your way out the door.
NorthernLitUp

NTA. Don’t sign a lease with him again. His word about how he’ll handle his mother is worth less than nothing. She’ll be back.
DistributionOver7622

And he NEVER gets to stay over at your new place. I wouldn’t put it past him to get a key and give a copy to his mother.
Quillhunter57

NTA, get your own apartment, and get single. Your boyfriend is unreliable, you know that. Time for a fresh start.
9smalltowngirl

NTA move out on your own. This relationship is over. Unless you want her and his brother living with you forever.
AdhesivenessTrue5708

Do it before you get too deep and marry or have kids with him. He’s gonna put his mom and brother first
SheWolfCoven

You are his girlfriend, not his wife. That is not your mother in law. Don’t move in with him and her.

Conclusion

The original poster (OP) established clear, necessary boundaries regarding the boyfriend’s mother’s cohabitation, primarily focused on cutting off enabling behavior toward the destructive brother. The central conflict arose when both the mother and the boyfriend violated these agreed-upon terms, leading the OP to feel betrayed and questioning the enforceability of any future joint decisions.

Given the boyfriend’s inability to enforce boundaries due to guilt and the mother’s immediate expectation of continued free housing, the core question remains: Can a relationship survive when one partner consistently prioritizes another person’s comfort (the mother) over mutually agreed-upon commitments, and is the OP justified in seeking separate housing to preserve their own well-being and financial stability?

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