haha thats fun... no you know he likes you if he is acting wird around you or maybe can't look you in the eyes he may orso sometimes look at you when you do not look or just be friends with his best buddy and ask :D
It is ok to like a guy after you know he likes you. That is perfectly normal and a part of life.
If a guy likes you but you don't know him he may look at you or walk by you whenever possible.
Not sure how you expect someone to magically know something.
If he says i like you
This is a tongue twister. And no.
If a guy likes you he will flirt with you but if he doesnt like you then he would act like he hates you.
if he acts like he doesn't
Ask him
You wait.
nothing! they maybe know that the guy you like likes you back!
kis and do it
Break the silence, Get to know him a little bit if you like him and he likes you