If the girl has dumped you, then the only logical theories are either...
A. The girl found someone who she thinks is hotter and sexier, by maybe cheating on you, or B. The girl made up her mind to get all stupid on you.
I'm not saying it really did happen, I'm saying that either one of the two things may have happened. Or is that wrong now?
Maybe next time, you'll play it cool and not rush things to "get" a future woman.