Why would a guy stare but not smile and walk past you whenever he can?

Anonymous
The first time we made eye contact, I looked up and he was staring at me. He kept staring without a smile and finally I looked away (this was for like 3-4 secs). I tried to go up to him after class to ask him about it but he avoided me. I once asked him a question in class, he gave me a one word answer, wasn't smiling or anything?

Now when the teacher hands back stuff, he will wait at the front of the class to pass me whenever he can. I pretend that I don't see him because the first time it was too awkward. he has never really tried close to sit with me or anything but have noticed this few times in the hallway, I have seen him waiting for a class to start and he'll just stare again (obvious stare) but still not smiling? Another time he was sitting outside staring from far away?

Does he like me, think I like him, find him weird? what should I do?
Why would a guy stare but not smile and walk past you whenever he can?
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