Marriage isn't the end-point of a relationship. It's just a stepping stone, one aspect of a long-term evolution between two people who have, for whatever reason, decided to take a leap of faith and say, 'Well, hey, this is a person who I want to try with for the rest of my life.' Which is not a guarantee of perfection - far from it.
I am responsible. Although I may not be able to prevent the worst from happening, I am responsible for my attitude toward the inevitable misfortunes that darken life. Bad things do happen; how I respond to them defines my character and the quality of my life. I can choose to sit in perpetual sadness, immobilized by the gravity of my loss, or I can choose to rise from the pain and treasure the most precious gift I have ? life itself.