he should block his ex.

I've mentioned it before, but I think the reason he hasn't is that she never forwarded her mail, so she still gets stuff at our apartment that he has to text her to pick up.

he is doing nothing wrong so there's really nothing he needs to change.

Mhm, that's why I said that I know it isn't fair of me, and I never blamed him for anything. I'm aware he hasn't done anything wrong, which is one of the reasons why this whole thing frustrates me that I feel this way. And by communication, I meant in reference to the fact that it's a pretty normal thing amongst partners to make sure that you didn't contribute to them getting an STI, etc. Yes, I'm insecure about this, but just pointing it out doesn't help me change. I appreciate your comment, but I was really hoping for someone who had been/is in a similar situation to say something about how they helped themself come to terms with it. If there was something specific they thought of or did that helped them let go of the whole thing. And I apologize if this sounds bitchy, it isn't directed at you, just sick of this stuff bothering me.