Guy in my class keeps staring at me in a strange way — why?

There’s a guy at my university. I’ve been catching him looking at me in class since last year, but the way he looks is kind of strange. He squints his eyes and stares like he’s trying to figure me out or analyze me. He has a girlfriend, so I don’t want to interpret this as him liking me.

Why do you think he does this?

Has anyone experienced something similar?

Guy in my class keeps staring at me in a strange way — why?
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