Most Helpful Guy
I think you messed up. He obviously thought that you guys had something serious and when you made out with another dude it showed him that you don't feel the same way. He's probably having a lot of trouble letting go of you which is why he is trying to get back into your life. He obviously considers kissing cheating, but he still has feelings for you. He is definitely still hurt. If I were you I would apologize to him and try and show him that you care about your relationship as well. i.e. ask him on some dates. You're going to have to earn his trust back.