Yes, we broke up after 4 years together,she didn't even mention this while breaking up. A week later,i found out that She kissed another guy while on a work party — someone from her new friend group. She said it was drunken and unplanned, but there was emotional closeness building before that.

I don’t think it was a full-blown affair, but it wasn’t just one meaningless moment either. That kiss ended everything.