Well, letter is done. Even bought nice stationary. There is a lot of validation in it - for her, that is. I actually feel pretty good about it and openly accept the fact that it is not a silver bullet and will not magically send her running back into my arms. That's gonna take some time.
Regarding the "I think you're happier not being married to me, I always suspected that would be the case" line from her, I said the following:
"I have found happiness, W. But it is not for the reason you think. I am happier because after 38 years I am finally getting out of my own way and focusing on building the things that make my life happy and walking away from the negatives that I brought down upon myself that were taking happiness away".