he likes you
Get that guy's best friend to tell that guy that you like him, and to ask you out.
Ask him out or get a friend to ask him out for you .
Your friend isn't your friend - or if is is trying to show you it's easy to ask someone out who you like/challenging you to go out too, and if you really are interested in this guy, I would suggest asking him out after your "friend" brakes up with him.
Ask your friend what did he said
A date, if your both single. Ask him out. Almost all "guy - friends" would gladly go out with someone.
start liking someone else the boy might get jealous and ask you out but then you have to deal with your friend
you get one of your friends to ask him if he likes you, then tell that friend to ask you out
you should not ask out the guy while your friend is dating him. You do not want to risk losing your friend. If they two of them do not work out then by all mean ask him out.
Ask him
Ask your friend if its okay to like him first.
If you mean eleven years of age , which I presume you do, just be outright with it. Get him when he's on his own and ask him , " Do you like me?" (maybe say that someone else ie. a friend says that she thought you the guy like you). Or you could post a note in his locker, ask him through a friend or ring him.
Ask if you like him for him, or like him because your best friend likes him - then either ask him out, or do not.