smile at him back.. that's a really lame question.
he smiles at you, copies you
Usally if a boy smiles and stares at you and likes to hang out with you
Probaly love!
when he looks at you continuously and smiles at you
That you're funny looking.
He like/has a crush on you
that boy likes you or wants to be your friend
just act your self and smile at the boy boys love smiles :) x
It probably means he likes you.
Not necessarily, but if he asks you out or something, then definitely.
Likely that he's a nice person.
Smile back and say "hello".