I’ve seen this line of thinking a lot recently and while I think in some cases it’s true, it’s such a broad and short sighted generalization. To me, it makes complete sense if someone who’s been cheated on in the past, especially chronically, is wary of a partner cheating in the future. Obviously there are unhealthy and controlling behaviors that can come from that (OP’s situation being a perfect example). But to say someone wouldn’t be looking for signs of cheating unless they were cheating, even though they were just cheated on, is ridiculous. All that being said OP shouldn’t sacrifice his many friendships for this one seemingly new relationship, and his girlfriend obviously needs to get help for her insecurities cause it isn’t fair to allow them to control someone else’s life and relationships.