My boyfriend and I have been together for almost two years. We have had rocky points before, but never enough to break up. The biggest fight we ever had was when we were both entertaining opening our sex life up to a third (we are both bisexual and open/curious so this seemed like the move). We were on different pages with what we considered appropriate so we never went forward with this. We hit our stride and it began to get comfortably boring between us. Sex less often, less affection, you know.
I found out he is out at a bar playing pool in the middle of the day. This is not normal for him. I ask who he is with, and after prying I find out he is with this random girl he used to hook up with two years ago and hasn’t talked to since. He doesn’t find anything weird with this, says he randomly ran into her a week ago and reconnected. I ask to see his messages (I’ve NEVER done this before or been this kind of partner). He was openly flirting, swiping up on her pictures, commenting on her boobs. Says this is how he is with all his friends (they are almost all women and I don’t have a problem with that). For context: he is very jealous when i even mention an ex, but i haven’t held him to the same standard.
He send me a screenshot after I ask him to leave my house of him asking the girl to confirm nothing happened between them. She only responds with “you have a girlfriend and this is inappropriate. Block my number”. He’s still denying that he had no intentions other than friendship.
I don’t know what to do. There is no way I can get proof of what he was planning to do. I broke contact for now and told him I needed time to think. Is this enough to end a relationship? Especially if It’s lost its passion but love still remains. I’m hurting here.
TL;DR! : my boyfriend was probably in the process of hooking up with an ex. Limited proof. How should I go forward if he won’t admit?