Maybe you didnt do anything wrong. Give it some time. Guys are weird. They do things a whole lot differently than we think they are doing. We read signs, watch for signals, but usually we dont have a clue whats going on, and neither do they!

I would take the initiative and strike up a conversation next time you see him. Guys like that sometimes. But if youre too scared or shy, I understand. But think about it, there is nothing wrong with going after what you want

Good luck and tell us what happens.