You have to ask him.
If he shows signs as smiling winking and tries to make physical touching and complementing then you can tell he likes you.
I think he likes her way deep down, or that he is doing certain things to make them tell that she likes him. I think he is trying to make her tell him that she likes him.
well sometimes a guy would make fun of you to try to not make it obvious that he likes you and sometimes they will always want to be around you and last they will just act weird around you and shy.
the best thing you can do is tell her that you like her. make sure you compliment her and also ask her who she likes.
You can tell by if hes always trying to make you laugh or if you stare in his eyes and his pupils are big. then you know.
if he hits on you
if he likes you for who you are
If you make it clear nothing is wanted nothing will happen if you want it tell him
you can get a guy to tell you if he likes you by just being yourself or just coming out and asking him, "hey do you like me?" what do you have to loose?
If a guy likes you he will turn around and look in your eyes.
if a guy likes ur friend he will flirt with her and not u.
if a guy likes you but you dont like him, tell him your not in to him and say sorry.