Quote: Sadness about the finality of loss, guilt about my "quitting", fear about the unknown, and resignation to this reality
Sound like very normal emotions. You should close the chapter on this marriage. The last words have been written. If you and your XW are ever going to be together again it would only come from writing a new chapter, actually more like a new book, with all the demons of the old chapter/book put to rest. You are not quitting, just doing what is necessarily to have a full, complete life. I'm happy for you.
Me
In the end, it's not the years in your life that count. It's the life in your years. Abraham Lincoln
It is hard to fail, but it is worse never to have tried to succeed. Theodore Roosevelt