You can smile back if you would like. It is likely just a smile, which is a common exchange between people.
he smiles at you, copies you
Usally if a boy smiles and stares at you and likes to hang out with you
Probaly love!
That you're funny looking.
when he looks at you continuously and smiles at you
He like/has a crush on you
just act your self and smile at the boy boys love smiles :) x
that boy likes you or wants to be your friend
Perhaps they have a Halloween disco?? With punch?
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.