My wife died suddenly in 2000 in a car accident. I later found out that they had discovered she was pregnant at the time of her death. We found out I was sterile two years after we got married when we were trying to have a baby (we ended up adopting a baby girl months later).
Though I still miss her every single day, that has always hurt me. I tried to be a good husband even though I couldn't give her biological children. I know this happened almost twelve years ago, but I've always wondered what was wrong with me that she'd do that to me.