It can mean any number of things.
It could mean that the guy likes the girl as more than friends.
It could mean that the guy likes the girl as a friend.
It could mean that the guy wants to spend more time with the girl.
It's hard to know specifically without more details.
Just pay attention to how the guy acts around the girl and that will give you clues as to what it means. (i.e. Does he pay for her? Buy her concession stand food? Compliment her? Ask her to do other things? Include other people when they hang out?
That he either likes you or he's just friendly
He wants to see a movie. Or he's gay.
It depends on how he asks but usually no if you have known him forever
he likes you and finally worked up the courage to ask you out
He is worried about you.
Not necessarily
Red
It means he likes you.
They like you
he has dry skin.
it probably means he likes you lol
sex!!
It means she is catching the bus to see a boy.
They probably ran out of things to say and then didn't want to rush right into asking you to the movies so he waited until he thought it was the right time to ask