He stares at you a lot and talks about you too.Trust me I'm a popular boy that hangs out with popular boys and this is what we basically do.Also if that boy has a best friend that is a girl and you are good friends with her ask her if that boy likes you and snap! You two are dating in no time!
you can't really unless they say they do
You can tell that a boy likes you if he looks at you a lot or he will send you a note sating that he likes you
That he is shallow.
you know if a boy likes if he gets nervous when he is around you, stumbles alot when he sees you, and he is always finding an excuse to talk to you.
if he farts on your face
Ask him
when he does anything to talk to you
He talks to you.
The best way to know is to ask him.
Well, it really depends on the peron? And if your not sure just ask him, or have one of your friends ask!
He likes you that is what is important. it doesn't matter who else knows you.
get to know him!