Usually when I take the time to sit down and ask a question on the board, I come up with my own answers. Got my answer! I think that although the note is good for me to release my feelings, it won't really bring about anything positive. My coach's suggestion to have closing conversations is good, but not essential.
I asked myself, what do I expect to come out of this other than to express how I feel? The answer was, nothing. The reality won't change, and I will once more play the role of the initiator of talks/ the one who analyzes, who takes charge/ the one who seems to know what's right/ the one who's being left behind. One of my 180's is to stop playing my previous roles, so a 180 will be to not share this note. In the future, if my H wants to talk about what happened, I will share what I put down on the note.
And if my H ever wants to come back to our R and I already have someone else, well, he'll have to deal with that. No need to warn him or anything like that.
Feel emotionally good about this :-) Now I need to go back to bed. Not feeling physically good at all...