Hey buddy What I did was to be determined I would not base my happiness on the reactions of others. I looked at worst case senerio (living under a interstate overpass in a cardboard box) and decided if that would happen I would be happy.
It is not an instant execution of that decision and it is not easy but it is necessary. Otherwise you will die a death every time a relationship fails. I believe God is in control and I am not thus if something falls through there is a reason or several and I am not privy to that answer. It does not matter if it's my, her, or no one's fault since fault does not matter.
Failure in a new relationship is better than a repeat of the reason you are on these boards and that does not mean the other person is wrong but possibly the relationship between you two was.
"All I want is a weeks pay for a day's work" Steve Martin