Maybe you should ask him straight out if he is, or perhaps suggest you meet up sometime to go to the cinema etc. and see what his reaction is.
I ended up with my current boyfriend under almost identical circumstances. Well he asked me who i fancied and i kept saying i wasnt going to tell (because it was him). However when i eventually told him, we went on a date and he asked me out.
Maybe he is just shy though, or not sure if you are looking for a relationship? Only sure way of knowing is to ask...aside from perhaps your pride, what have you got to lose? Good luck.