He Taps my desk when he walks by?

i like a guy in one of my classes and started talking to him on Facebook. he responded the first time but never really responded to the other ones sent him. at first thought that he was ignoring me, then yesterday I found out he was dating a girl in one of my classes. I never have enough time during the school day to talk to him and I don't want to talk to him after because he usually leaves right after school ends.

But even though he doesn't talk to me during school much; sometimes as he walks by my desk/table and taps it 2-3 times with his books or pen. He does it right in front of me...

sooo could this mean anything or is it just a weird thing he does?

and for the guys, do you do anything like this and when/why do you do it?
It is just a weird movement/tic that he does
It probably means something(he like me/doesn't like me/etc...)
Maybe (explain please?)
Other(explain)
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He Taps my desk when he walks by?
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