Friends with ex-boyfriend.

[UglyRabbit]

I think you need to trust your partner. Therer is not much you can do other than trusting him. If you push him too much about he seeing his ex, he will feel you don't trust him, which your relationship is going to go downhill and his ex, of course, is happy to ruin your relationship without doing too much damage. If your partner is honest/trustful person, then he will appreciate your understanding. Otherwise, the problem is from your partner not from his ex and you probably will find out. As long as you and your partner have good communication and if his ex doesn't take away your time with your partner, why don't you give him some space?! I am a quiet person and so I only have a few friends and I value my friends. I can understand your partner's point of view, but I will never be friend with someone I don't trust. This is only my personality, can't speak for yout partner. Try to wait to see what will happen than make something happen.

[ShiftyNJ]

I am friends, or at least parted on good terms with, everybody I ever dated seriously except one, who is mentally imbalanced. I don't hold ill will towards him but he makes me uncomfortable.

That said, I think you are being pretty reasonable, but ultimately have to decide if this is a show-stopper for you or not. Maybe should make friends with the ex's new guy so you and he can hang out while they are, and see how either one of them likes that.