This guy just stares back with a blank stare - anyone have any reasons why?

Anonymous
I'm really into this one guy that I see around campus but we've never spoken. We always, always make eye contact and one time through the reflection I saw that he was staring at me (he didn't realize I could see him) and when I turned to catch him looking - he quickly turned away.

One day I was feeling confident and wanted to be friendly so I gave him a smile during eye contact and he just kept staring! No smile - just a blank stare. Since then he has stared at me but I have never smiled - that was just awkward and I feel silly! Why did he not smile back? Help!
This guy just stares back with a blank stare - anyone have any reasons why?
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