Why would a guy pretend to be interested in a girl?

I have been staring at this hot guy in the libary for months now- but he never made any eye contact with me yet he did notice that I have been looking at him.

now last week he held eye contact with me for a few seconds and kind of walks by me so I can notice him while smiling to himself :/

why only do this now? is he just doing this cause he knows I like him?

this guy is VERY hot and he seems confident and popular
Why would a guy pretend to be interested in a girl?
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