Is he a stalker or just shy?

A guy from my class messaged me on the college app where students submit their assignments. He asked if I would like to hang out after class and inquired about why I had missed a class. I responded by asking who he was because I usually don't pay attention to my classmates. He refused to show his face and would only describe what he was wearing. Curious, I asked him why he wanted to hang out, and he replied that he wanted to get to know me and study together. Later, he admitted that he might have come across as strange. I questioned why he wouldn't describe his appearance, to which he replied that he couldn't, except for how he looked at that moment.

Is he a stalker or just shy?
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