Why in f**k's name is my male coworker always looking at me?

I'm genuinely confused; he barely speaks to me but I always catch him staring/checking me out. The times I have tried to talk to him he has been kinda rude or nonverbal LOL. It's kind of starting to piss me off, because guys who like you or find you cute (especially coworkers) at least try talking to you. Even weirder, he like my only guy coworker who seem like he don't wanna talk to me.
Why in f**k's name is my male coworker always looking at me?
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