Recently, the narrator felt guilty about Mark being unaware of this major part of Jane’s past and suggested Jane tell him before their upcoming wedding. Jane strongly refused, claiming it was irrelevant information that would cause problems, and threatened to end the relationship with the narrator if the secret was revealed. Despite this warning, the narrator decided to meet with Mark and disclose the information, leading to Mark being shocked and hurt, and Jane reacting with extreme anger.

I (28F) have a sister, Jane (25F), who has been engaged to Mark (27M) for about a year. They’ve always seemed like the perfect couple, and their wedding is coming up in a few months.
However, there’s a big secret Jane has been keeping from Mark: she has a 3-year-old son that she gave up for adoption before they met.
Jane and I have always been close, and I was there for her during her pregnancy and the difficult decision to give up her baby. She made me swear never to tell anyone, and I’ve kept that promise for years.
But recently, I started feeling guilty knowing that Mark has no idea about this part of her past.
I brought it up to Jane a few weeks ago, suggesting that she should tell Mark before the wedding. She got furious, saying it was none of his business and that it would only cause unnecessary drama.
She reminded me of my promise and said if I told him, she would never speak to me again.
This has been eating at me, and I finally decided I couldn’t keep it from him any longer. Last week, I met with Mark and told him everything. He was shocked and hurt that Jane had kept such a big secret.
He thanked me for telling him but also looked devastated.
Now, Jane is absolutely livid. She’s called me every name under the sun and said I’ve ruined her life. Our parents are divided: my mom is on my side, saying Jane should have been honest from the start, while my dad thinks I betrayed my sister and should have stayed out of it.
Mark hasn’t called off the wedding yet, but he and Jane are currently not speaking to each other. I feel terrible about the pain I’ve caused but also believe Mark had a right to know the truth before marrying Jane.
Conclusion
The narrator is currently feeling distressed by the pain caused to her sister and the resulting family tension, but she maintains that she acted correctly because Mark deserved to know the truth before entering a marriage with Jane. The central conflict lies between the narrator’s duty to uphold a promise of secrecy and her belief in honesty, particularly regarding major life events that affect a future spouse.
The core issue for debate is whether the narrator was justified in breaking her sister’s confidence to ensure Mark’s right to informed consent in his engagement, or if the narrator overstepped by interfering in her sister’s relationship and violating a deeply personal promise. Was the potential damage to Jane and Mark’s relationship worth the revelation of this past event?
Here’s how people reacted:
I understand how strongly you felt that her fiance deserved to know, and I agree with you. But it wasn’t your place or choice to tell him. This isn’t a case of her cheating on him, it’s a personal decision of hers about whether to share or not something that is firmly in her past.
Personally, I agree that secrets of this nature should not be kept from one’s spouse BUT it’s up to the individuals within that relationship, not others outside who see things differently.
She should have been honest with him, absolutely.
But you should not have overriden her by telling him yourself.
It’s natural for Jane to be upset and feel betrayed, but her anger is misdirected. She should have been honest with Mark from the beginning, and her refusal to do so put you in a difficult position.
It’s now up to Mark and Jane to decide how to move forward. You did the right thing by being truthful, even if it was a difficult decision.
He did NOT need to know. It was NONE of your business. It’s none of his. It wasn’t his baby, it didn’t concern him.
Do you want Mark? Is that why you did this? Bc this act reeks of jealousy and insecurity. Is it bc you’re older and not getting married?
How trashy. You asshole.
I hope you get this repaid back to you ten fold and someone destroys your happiness over a decision you’ve made in your past. What a horrible thing to do to your sister.
This is something your sister should absolutely have told Mark before the wedding.
If SHE found out after the wedding that Mark had a son out in the world somewhere and Mark had never told her. every post here would be crucifying him.
I suspect your sister will not get a similar bashing.
Such is Reddit.
Not your circus, not your monkeys. Why do you value Mark’s needs (“I couldn’t keep it from him any longer”) over your sister’s needs and what you promised her? What is your connection with him?
I am not going to question if he needs to know the adoption or not, but in any case it wasn’t your turn to tell him.
I think I would have searched for a way to let Mark know about this without directly telling him. Sent him an email from a burner account or send a letter that the child is trying to find her or something.
People like this are why some women choose to terminate a pregnancy in secret, even when they don’t want to. Fear of what may come later.
update me
Look what you’ve done. I hope you learned your lesson to mind your own.
I never understood how the guilt of other people’s secrets “eats them alive”.
She should of not build a relationship on lies, its on her not you.
So Mark was more important than losing your sister to you.