<human>: Can you provide a brief overview of the text?

Heya.

My ex and I have the same friendgroup and live in the same dorm, so we run into each other a lot (lounges, meals, etc).

I ended things almost two months ago because I was no longer interested in the relationship. He was too clingy and insecure, and though I tried to make things work out, I couldn't stand being lectured to as if he were in charge of me / was my parental figure or something.

The problem is that we run into each other a lot. I am friendly/civil with him, do not provoke, just enough to try and make things not awkward. For the most part, I am treated as if I do not exist. That's not really my problem - if he needs to act that way because his feelings are hurt, that's fine, I'm just not going to let him destroy the friendships I have with our mutual friends, and not participate in activities I enjoy just because he might be there.

The problem is that every so often I'll get a passive aggressive message with a reprimand or warning from him. I can't block email to my knowledge. I end up reading it and I respond as rationally and calmly as I can. What he views as "out of line" is something that everyone else does, but it's only a problem when I do it, and not when everyone else does (ie, shouting during a sports activity).

A mutual friend of ours has offered to be a mediator since this doesn't seem to be resolving itself. Do you think it is a good idea? I think I am for it but I don't know that he will be, and I think his pouting and passive-aggressive-ness is the root of the problem.
<bot>: My ex and I have the same friendgroup and live in the same dorm, but when he thinks I am "out of line" he keeps reprimanding me like a child. Is mediation possible?