<human>: I'm looking for some opinions on how to handle this.

Recently my gf of 4 months broke up with me, but really no hard feelings, as it wasn't over anything major, just compatibility in general.

I found out that they had started to hang out and it makes me feel  betrayed by my friend that he may be making a move on her. But I'm also not so sure thats what it is, as they had spent some time together before (non romantic as I can tell), but they had never been very close friends.

I realize that I don't have any right to tell him or her who they can hang out or date with but it does make me a uncomfortable with the whole idea. Should I mention this to him? Or am I just being a little prick??

Sorry if it sounds like I'm being a whiny teenager.

Condense the text into a few key points
<bot>: Friend and Ex-Gf hanging out after we broke up. Feel like friend may be romantically interested in her. It's making me uncomfortable.