Why would a guy stare at you all the time when he isn't interested in talking to you?

I've tried talking to him a couple of times but he seemed rude and other times he ignored but he keeps staring at me all the time especially when I'm not looking. My friends have noticed him doing this several times. His behaviour is just bizarre and I'm very confused.
Why would a guy stare at you all the time when he isn't interested in talking to you?
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