WIBTA if I told my younger sister’s fiancé that she lied about my older sister when they met?
My older sister: Kay (f32)
My younger sister: Jay(f28)
My younger sister’s fiancé: Matt(m32)
Kay and Matt met at work about 2,5-3 years ago. He was hired in as a consultant at her company on a few months assignment. They became close but nothing happened because they probably didn’t think it was professional. I think both (or I know that my sister at least) was hoping that it would develop to something more when his assignment was completed. Kay is a very shy and private person but even with that she couldn’t stop talking about Matt to Jay and me. When she turned 30, we encouraged her to invite him too with the rest of her close friends from work. She was very hesitant and panicked at first but then she thought yeah why not, his assignment was almost done anyway.
Matt and Jay met at that party. Six months later Jay told us that she and Matt are a couple. This devastated Kay and I knew that even if she held herself together and pretended to be happy for them. I almost made her confess her heartbreak to me because I couldn’t just let her hurt alone without any support. Kay said That after her birthday Matt changed towards her and was even a bit angry. Then when he left he stopped talking to her all together. Kay said that she probably misinterpreted his interest in her. I know that she is still heartbroken about it. Matt was assigned with her company some more times again and it was awkward at first but eventually they were friends again. Now he is a part of the family. Kay never showed that she’s hurt.
Now I found out that Jay told Matt that Kay had a bf at that birthday party. Matt is very handsome and lovely and Jay basically wanted him. Matt was shocked at first because he was hoping for something more but he probably just thought that he too misinterpreted my Kay’s interest in him. He is very shy too. After the party he probably decided to cut his losses and not pursue Kay. Jay however kept contacting him. Asking him out. Be supportive. First he refused but then they started dating. How do I know all that? Jay’s roommate spilled the beans to me thinking I knew everything (I am closer to Jay than Kay). Matt has now proposed to Jay.
I feel sick because I want to tell Matt what happened so he makes an informed decision. Marriage is not a game. At the same time, he and Jay seem to be perfect for each other and the love is genuine. Maybe he was interested in Kay yes, but obviously it wasn’t that deep? Also Kay? I want to tell her but she seems okay with the relationship too. She made it clear that Matt and Jay obviously meant to be or it wouldn’t have happened. But I want to tell.
Would I be the AH if I told everyone what happened?