What does his eye contact mean?

So if a guy has a crush on you, does he hold intense eye contact or avoid it? Does he do both?
i was wondering bec this guy sometimes looks deeply into my eyes and smiles. Other times he gets all flustered, smiles, and looks away/can’t keep eye contact. Then I see him stare and smile into another girl’s eyes and then sneak glances at me from his periphery vision I don't know

What does his eye contact mean?
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