If he or her always looks at you and if they "flirt" with you. Also if you look into their eyes and see how they look at you you can most likely tell it happened with me an a guy I liked an he was able to tell threw the look in my eyes and also if they always are around you if they dont leave your side they are HOOKED to you
if he stares at you and tell to someone he likes me or tell me he likes me
Blondies aren't any different than other people. If you can tell when someone else likes you then you can tell when the blondie likes you
you can tell by their face.
tell them to get over you and date someone else.
If u find a change in someone's behaviour
Tell him
they'll flirt with you
Ask them or failing that waterboarding
Ask her.
Then tell that person if she likes you or just leave as is
you tell someone who he likes and then you tell them that he was talkin about her
get with another lad to try and make your crush jealous if it doesn't work then he likes someone else or get a friend to ask him if he likes someone and if he does tell your friend to ask him who he likes. if he doesn't like you then move on you can find somebody better then him, somebody that actually loves you.