There are no real friendship between boys and girls?

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As is often the case, when a girl left her boyfriend, the boy and the girl will not be close friends again. Even through they have said they will be friends after break up. How it happened? I have the experience and many friends of mine had this experience. What can we do to deal with it and have a good relationship with her? I haven't seen my girlfriend when we become gf and bf for that we are in different schools. After a month and a half, I found that I didn't love her. I have no feelings. As a result, I point out that we'd better break up. And I make sure that we are good friends just like we used to be. But the result turned out to be we may not be good friends but aquaintances. I'm very upset about it, because I don't want to lose the relationship between us. What I shoud do?