It always depends on the boy of course, but sometimes if you are looking at him and he looks at you then turns away quickly. Sometimes if he is mean to you in a flirty way or just plain mean to you it could be a sign. If he is flirty with only you. Sometimes if his friends are always pushing him to talk to you it could mean something. Again it always depends on the boy, and the age of him.
He flirts with you
You ask.
you just have to trust him
go to howcast or youtube to get it it works
Ask him.
It means he really likes you a lot and wants to get to know you better.
really truthfully I don't know but I just asked the guy I like if he likes me and he hasn't said anything yet but when he does I'll let you know
So he can beat them up!!
Tell the person
I've heard that they really like it when you know a lot about a topic he likes, and he really likes it when you know even more about the topic than he does
Ask him " are you playing or do you really like me? "
Well he can act like he hates you.