If he's doing or watching something he likes and he looks at you more then five times he likes you.
If he stares at you, smiles and is really nice to you then he probably likes you.
try to find out if the guy you like likes you back. if he doesnt and you like one of the other 2 guys that like you then youll have a better chance with that person if you dont like the 2 guys and the guy you like dont like you then theres nothing you can do.
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.
If he says i like you
Not sure how you expect someone to magically know something.
look it up on youtube theres a video of 25 things that show that a guy likes you
Date before he moves away or don't at all
You should go for it theres no other way to really know unless you really ask instead of just letting a friend do it for 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