Most Helpful Guy
So you already saying he has insecurities, can already lead you to why he acted the way he did. Someone insecure will make a situation very dramatic and make it about themselves to get sympathy. When he said he wouldn't mind for you to hang out with that guy, he thought of being a cool boyfriend and not caring because he "trust" you. Which obviously someone insecure that hasn't had much experience in the world can and will always do that and never trust. So don't worry about anyone hearing his story, all he is trying to do is cover his insecurities by making someone else the problem. I also see someone posting about him cheating. Well that's not necessarily true. It possible that he felt JEALOUS. Now I say this because, nature works in mysterious ways and you were already in the past hinting a break up and that body language will continue to be there until it happens. So mentally he was probably getting prepared for that and he may have been trying to get with someone just to prepare for the break up, hence the rebound 2 weeks after. So he was jealous because you beat him to finding someone new.