Why does a guy 'constantly' stare at a girl he doesn't like (not sure if he doesn't like it)?

Anonymous
We are constantly making eye contact, whenever I try to look, he looks at it beforehand, which is very strange. The last time he talked to me was 2-3 months ago, we've been seeing eye to eye since then, and I don't think he likes me because he doesn't talk to me.
Why does a guy 'constantly' stare at a girl he doesn't like (not sure if he doesn't like it)?
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