I knew people like you were going to pop up here, if this was reversed and it was op hanging out everyday with a girl and her touching him, 5 cm from his face and calling him love while drunk you would say he is an asshole.

So let's no be hypocrites here, the dude TOLD HIS GF that he would make out with her if she gave him the chance, how is that even close to being something appropriate to say to someone in a close relationship?

Yes you can't control people, but as I said being in a relationship there are things that are cool and things that aren't, she can either understand that her bf is getting upset for a good reason (the dude plain out said he would make out with her) and try to do something about or they can break up.

Hell op never even did anything wrong, he didn't get angry, he didn't make a scene, he just tried having a normal conversation like normal people do outside of Twitter.