Men are pigs! 99% of the time they think with their main brain (which is not the one in their head).
It is very possible this guy likes you but is actually shy. It is also possible he is just trying to get into your pants so he is trying to play all 'hard to get'' in order to get you more interested.
I would suggest that you go out for a drink with him, enjoy yourself.
DO NOT SLEEP WITH HIM!!!!!!!
Flirt with him, wind him up, the more the better. Then leave him with nothing more than a kiss. If he calls you back he really likes you. If you never hear from him again, he wanted nothing more than sex!!