Most Helpful Guy
Well maybe he likes you, but think that you are way above his league. That is the unique reason that stops a guy from trying to pursue a girl he is interested in. Since you don´t have a photo of yourself, i cannot know how attractive you really are, but i would say that he probably thinks you are way above his league, so he didn´t have the courage to go after you, and probably won´t have in the future, but when he pass by you he takes his time to appreciate your beaty, i have done the same thing a lot when i was in school also when i felt that a girl was way above my league, but i tried to be less obvious than he is being about his attraction by you.
Most Helpful Girl
He possibly heard a rumor about you and is curious.