I don't think choosing to stay with your wife when she might have needed your help was a bad choice, but it sounds like you let go of yourself somewhere.
That's all in the past you can't change it but it can be an insight into what didn't work. Work on you and as 25 says, become the better option.
Me 57/H 58 M36 S 2.5yrs R 12/13
Let me give up the need to know why things happen as they do. I will never know and constant wondering is constant suffering. Caroline Myss