what a jerk sorry that you went through that, he most likely is a coward and chickened out, may be he's not ready for a relationship or something serious you know? he's still in a boy stage where he's horny and doesn't know what he wants but still likes to flirt with women, he just does the talk but can't do the walk. I've seen a lot of guys like that. if you see him again just pretend you didn't see him and smile to yourself, be happy and just move on laugh with your friends and have a good time. don't let it show that it affected u, trust me its the best revenge for him.