The ending shouldn't determine the meaning of anything, a story or a life. Logically, I don't think it can--didn't Heidegger say something to that effect? That the meaning of all our moments cannot be contingent upon an end-point over which we have no control? That if we are happy right now, that means something, even if we die tomorrow? Narrative integrity is overrated. I don't need to know that the story of my life has a happy ending to enjoy it. A good thing, too, because I hear all the characters die in the end.