It means she is SERIOUS
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.
Shes in to you
It means she doesn't know who she is to you.
They like you
it possibly means that the girl likes YOU!
could mean anything.and i do mean anything
some people say it's because they like you, but every girl is different, if she is mean to just you, ask her jokingly if you did something wrong, i am tough to some boys because they think i am weak.
no but it would be nice
sex!!
to mock in a jokingly, but mean way
yes or the guy is just flirting with the girl