Yes, it was a beautiful letter, and I know it is not a goodbye, although you may need a short break for simple meditation. It's been a very rough few weeks lately for you. We all understand that.
Many of the things you said above apply to me, as well. I did way too much assuming in my R with my H. I have never been particularly touchy, feely; but thought after 20 years my H would know how I feel about him. So if there is only one great lesson to be learned on this Board, it is that the axiom about the word ASSUME is correct.
You are a beautiful person, and you will be still be a beautiful person if divorced. This too shall pass.
Do your deep thinking, write the letter, concentrate on your life. We will always be here for you. ((HUGS))