Guys, why do a guy stare when he already has someone?

I'm in highschool a "junior" and the person i used to like is a senior and a whole lot of stuff went on. Eventually i distanced myself.

there is this girl i am assuming he "talks" to. The guy and i , we have the same second period or lets just say whenever i'm near him/his friends always stares at me. Nothing changed from my 9th grade year. Yea i'm just wondering whats the reason , anyone knows?
Guys, why do a guy stare when he already has someone?
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