what i do is get your friends to go ask him who he likes. if he likes you you call him or text him asking him out. you can also tell by the way he acts around you. if he smiles,talks,or do anything to get your attention still he likes you still.
well if he comes around you and acts crazy or acts like he doesnt know you those are sometimes signs that he likes you but you should just ask him out if you like him :)
There is no easy way to know if a guy likes you. The easy thing to do would be to just ask him. If he knows how you feel about him, if he likes you too then he won't be too nervous to tell you his feelings!!