Guy's Behavior

What does it mean when my crush glances at me when I walk past him?

okay so when my crush was listening to some girl talk and leaning on her desk, i was all the way in back in the room, and i left to get something in the storage room and came back and when i was walking past him, he stared at me and so we both made eye contact. so then i walked all the way back again and then i saw another girl coming towards my crush but he didn't look at her. and then when i walked back, he looked at me again. but it wasn't like a quick look. so why does he always look at me from far away? does he think i'm always looking at him or does he like me? oh, and he always glances at me when he comes in and out of the main room. like when i'm not looking and he walks back fast to his desk he always looks at me. and when he looks he never smiles or looks away. he never talks to me. but when we do talk, he's not really shy he's just quiet around me. so what is it?
What does it mean when my crush glances at me when I walk past him?
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