Hey KAW. I'm sorry, bud. It's a good letter...and I certainly wish for the best. If I might interject my humble opinion regarding one thing...
You said "I truely think she believes I will always be there for her and that whenever she wants I will accept her back." Given this, are you sure you want to say: "If at some point you wish to come back, then I guess we will need to talk." I also think it's not entirely necessary, as you also said: "I can no longer say with any certainty if you decided to change your mind and come back, I would be willing."
You'll have to forgive me, as I'm a bit out of practice on being on the BB... I'm proud of you, you know. You have held up so very well over the last few years and have stayed the path. You continue to be an inspiration to me, KAW. I feel deeply saddened that your W cannot seem to get herself out of this slump.
I'm glad you're doing something for you, KAW. I hope you find peace in this my dear friend.