What does it mean when a guy lightly brush against a girl's sleeve when passing by her?

Anonymous
There is this guy who is in two of my college classes. In one of my classes he sits on the same row as me. I am quiet and we hardly never talk. If he does say something, just to ask me a question about class. When he passes by me, he will lightly brush against my sleeve. He has done this more than one time. There be room for him to walk.

I was sitting at another place on campus and he lightly brushed against my sleeve, arm. I would like to know what does it mean when a guy lightly brush against a girl's sleeve, arm when passing by her?
What does it mean when a guy lightly brush against a girl's sleeve when passing by her?
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