Why are this guy's friends staring at me?

ok,this guy has never spoken to me but we were making eye contact often and he even smiles at me.but I stopped noticing him because I thought he wasn't interested as he didn't approach.

then he tried to make eye contact many times , this was when maybe I heard him talk about me to his friends.now I think he has given up as he looks at me rarely but his friends continue to stare and some smile at me.could that mean this guy is still interested or is it something else?
Why are this guy's friends staring at me?
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