I REALLY NEED ADVICE - What's going on with my ex?

It's obvious this guy still likes you. He's probably as confused as you are though. I'd say play it cool. You broke up and he's still flirting with you. So be friendly and don't allow him any liberties you don't want. Let him be the one to ask you out again but don't let him keep you from forming other friendships. He's acting very possessive and yet you two aren't dating. Eventually you may need to ask him to leave you alone because other guys are going to see his possessiveness and stay away.