Confessions on a Concrete Wall

I just learned what it's like to love someone and be loved and he already doesn't love me anymore. I don't know if he ever loved me but it sure seemed like it. Maybe he just loved the idea of loving me and when he actually had the opportunity he realized it was all in his head- not real. But I love him and it's probably the worst feeling in the world. I can't understand why he doesn't love me like I love him. I don't know what to do.