Guy catches you staring and smiles? A good sign?

Is it a sign that the guy could be attracted to you if he catches you staring and smiles? What if you stare and don't look away, but don't smile either? Like a blank stare, but you keep looking.

Also, if a guy takes a double take look at you, is he attracted?
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+1 y
what if the guy looks away but is smiling?
Guy catches you staring and smiles? A good sign?
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