I think your question lacks information. For example, does your boyfriend and his ex have kids or any other reason for talking? Also, are you saying he has cheated on you with her?
It is more likely than not.
You're worried that he might do it again - so you dream about it, that's all. It's not proof of anything else than your very understandable concerns.
not to be rude but if he cheated on you i would not take him back. find some one else there are plenty of fish in the sea. no man should cheat on there girl. because he cheated on you if you do get him back he's going to do it again and again behind your back and im not trying to be rude just trying to keep you from getting hurt again
All you can do is tell him that you are sincerely sorry, and will never do it again. The rest is up to him to decide if he can trust you again. Give him that right because he deserves it after what you did.
Because you accepted & tolerated it the first time. You should not have married him knowing he cheated. If he can't be a faithful BOYFRIEND, why were you expecting him to be a faithful HUSBAND? By excusing it the first time, he was under the impression that you've forgive it again & again & again.
This is just my opinion, but I dont think I would be able to trust again.
I have, and haven't yet again.
Kick him to the curb, no self respecting girl/boy has to put up with that, if he cheated once he WILL do it again. You will find a great guy/gal who will respect and love you. this loser will not.
Leave him alone. He doesn't have to be (& he shouldn't be!) with you. He doesn't owe you anything. If you can actually be faithful, get another boyfriend & try it again. Cheating, if you want to cheat then face the consequences. Just stay single if you want to flirt like crazy; don't hurt someone because of your recklessness.
If he really loves and cares about you he won't cheat, but if he doesn't learn from his mistake he isn't worth it.
Your question suggests that you aren't particularly interested in your boyfriend anymore.
Your boyfriend is ego maniacal and selfish! He cheated on his ex and she hit the bottom of the barrel along with him by cheating on him. This is not a way to resolve such problems. Your boyfriend has had things his way far too long and you have the power to control this situation. Talk to your boyfriend and communicate to him that you will not put up with cheating like his ex had to put up with it and if he continues you will end the relationship. If you don't ask for respect or show you are your own woman then you can't expect others to respect you. He isn't the only fish in the sea. You deserve better!