If a girl tells you that a decision is up to you, this might mean that she wants you to figure things out for yourself. This can be important to show her that you care, so take advantage of the opportunity.
It so means they want you!
That for whatever reason, he doesn't want to be with that girl.
It usually means that the answer is pretty obvious and that she is testing you to see if you can figure it out for yourself.
She does not like him
When a guy tells a girl that, he more than likes her, he means that he loves her and is ready for a relationship with that girl.
It sort of tells the girl that you like her back.
Means that he is simply being a boy.
she probably got sick of you, no offense.
say go away
Probably!
You keep it