Why does a guy walks up next to me and just stands there?

There is this guy in my class that acts a little bit weird and am not sure whats up with him. So often he will slow down when he walks past me or stand next to me like he wants to tell me something. I usually ignored him because i thought it didn't mean anything. But i noticed that he gets out of his way to walk past me but won't say anything. And also he bumps into me without even saying sorry. Why does he do this?

Why does a guy walks up next to me and just stands there?
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