Art After 5, ch 31

Edward crying in the bathroom was one of the most heart breaking moments in recent FF history. Edward has led such an idealized life. In his world, marriages last forever, children are born of love and are cherished, and happily ever after isn't just a dream. Bella's whole life has been a parade of temporary. Temporary emotions. Fleeting relationships. Broken homes.

I don't think Edward grasps the magnitude of Bella desiring and promising forever. Maybe, he should be a little frightened by it, because she has no experience with what that means. In this case, he is the experienced one.