Why would someone observe me from across the room after finding out that I have a crush on him?

I can see that he glances at me because I always sit in the back rows. He would glance when im interacting with others and I would notice him mimicking my movements when we are in close proximity. He started doing this after hearing a rumor that I like him from a friend of his. Is he trying to get sings that I like him or does he want to figure me out. How would he act if he was attracted to me and how would he act if he wasn’t?

Why would someone observe me from across the room after finding out that I have a crush on him?
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