Is there the real friendship between boy and girl?

Is there the real friendship between boy and girl?Many student think that there is no the real friendship between boys and girls.If a boy and a girl walk together,they always say something. do you think that there is no the real friendship between boy and girl? a boy say to me"i like you" but i think i am just a student, and i think we'd better work hard at study.and i say"we can be just a friend" than he don't say to me any more. what's happen?