if a girl wrote you a note telling you she liked you and left her # and you called right away but she didn't answer and you left your # and then she called you and you weren't home-you don't return the call for a week but apologize and say you were busy -is it because you like her too?
you can't determine from that. Why make everything complex when there's a simple thing to just ask him if he likes you. Believe me you'll get the honest answer and you'll be happy that at least you tried, if you feel it's worth the effort, if not then you don't like him enough I guess :)