Why would a girl in a relationship stare at a guy everyday?

Long story short, there is a girl who has a boyfriend (that’s barely seeing with her) that has been staring at me every time she sees me. This is to the point where I stop looking and people around me tell that she’s looking when I’m not looking. I know I know people stare…. I’m only asking cause it’s everyday when I’m not looking. Sometimes she even holds eye contact if I stare first.

Why would a girl in a relationship stare at a guy everyday?
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