there really is no for sure way to tell, but if hes nice pays you compliments, and is really just a nice guy
You ask.
you lean in a bit, ofcourse!
You ask him :)
ask him.
Ask him if he likes your friend and if he doesn't, then you ask him out or something like that, but if he does, hook them up and be happy that they are happy.
I believe, being a guy, that a guy that likes you and you know he likes you back is afraid of being rejected and you not liking him.
Then just wait till he does he will sooner or later if he really likes u.
If he stares at you, smiles and is really nice to you then he probably likes you.
just be brave and ask him out
Talk to him! But what if hes really shy?
Really you can't tell, you have to ask him.
What you say is I really like you only as a friend. That he's a great guy and all but it isnt meant to be.