they are eather nosy or like you
it may mean she likes him but my friend asks me, and she has a boyfriend (but then again, she used to like him...)
Yes, that's pretty much exactly what it means.
he likes you
Not necessarily. It could mean he is trying to find out if you do like him, or he may just be trying to find out if you will make out with him. But anytime a boy that is not your boyfriend asks you a question like that, the chances that he is only interested in sex are pretty high. So, please, don't let anyone take advantage of you by pretending they like you, just so you will have sex with them.
because he probably likes you and wants to make sure that you dont like anyone else
It may mean that, it looks like he is prying to see if you are in a relationship and how you would behave in a relationship. Respond to him the same way if you like him, as him "if he had a girlfriend" questions, he will realise that you like him to. He may want to be that boyfriend..
He is asking you out. Reply as appropriate.
It means he likes you and he wants you.
Hes interested =) He Likes Youu
It means... that 1)he wants to find out what you see in him, and 2) he's searching for a compliment. :)
it means that he loves her This means that he is interested in her.