i used to be good friends with this guy, and i kind of got feelings for him, we stopped talking for a couple of months then had a one night casual hookup (not sex though) in the summer, anyways he has been a bit stand off ish lately because his friend and i had sex  ( okay this is making me sound like a whore lmao) anyways he's in one of my classes and i think this could make things better and get closer again, how do I get his attention again? Should I act clingy or not clingy?