The end of a relationship is not always a failure. Sometimes all the love in the world is not enough to save something. In these cases, it is not a matter of fault from either person. Some things cannot be, it's as simple as that.
Failure should be our teacher, not our undertaker. Failure is delay, not defeat. It is a temporary detour, not a dead end. Failure is something we can avoid only by saying nothing, doing nothing, and being nothing.
When I face the desolate impossibility of writing five hundred pages, a sick sense of failure falls on me, and I know I can never do it. Then gradually, I write one page and then another. One day's work is all I can permit myself to contemplate.