Why does this guy I know bump into me in the hallway?

Anonymous
so this guy I know bumps into me in the hallway if I walk pass by him and don't say hi like I will be walking down the hallway and he will bump into me slash push up against me and sometimes when he's on the other side of the hallway he will swerve and get in front of me and this one time I wasn't looking up and he swerved in front of me and when I moved to the left he moved to the left and he says he doesn't like it when I wear my beats in the hall because he says it changes my facial expression
Why does this guy I know bump into me in the hallway?
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