Could it be he is pulling away from you because he senses you are getting too close? Might he describe you as 'clingy'. Just a few thoughts I have.

Sounds like a neat guy but if he's interested in you romantically, I'm sure he would have moved on his feelings. But, in case he's the shy kind, what's stopping you from telling him how you feel? I think it better to get this out in the open sooner than later. The longer you harbour unanswered feelings for him the harder it will be for you. Bonne chance mon ami! Aurevior.