that they like you and want you to say i like you to back
It means he likes you.
They like you
that may mean that he likes u or that he is helpless or needy
The boy always has to aks the girl
they are eather nosy or like you
No, because what if the boy asks a guy and what if the girls asks a girl? So the answer is no, but it depends on how the person will look when asking the question.
Date his best friend.
his friend wants to know if you like him
A lot of the times yes, but it doesnt really mean anything.
That can mean they like you or they heard a rumer you liked him and he wants to find out for sure.
it could mean anything but if a guy asks me tht it would be just like a question it depends on how the guy asks it
He is worried about you.