NTE - I think it is beautiful. I think you did a great job at expressing your side of the equation, being understanding of her side, not just blaming her....very nicely done.
It is also very loving and mature, no sh*t-slinging, just the facts, ma'am. You did point out a few things to her, but you weren't doing it like "neener neener". You were just direct and honest.
The one thing that stands out though is that you are asking to pull away on the sex and find a counselor, but then what? In other words, I don't see any words about how you would like to truly fix this thing and you will put in 100% effort to do so, or conversely, that you feel this thing is doomed and you are not willing to put in any more effort. Therefore, there is no real ultimatum here nor a declaration to fix it.
I think its ok if you don't feel like working on fixing it and pulling back on the sex. But then...the letter doesn't really say what that means exactly? Your last line suggests "we can work on these and improve our marriage", but there is no oomph in that, no real idea of what that means to you or what it looks like. In other words, you didn't put your foot down and say "if it doesn't improve, I will ask for a divorce".
Maybe you are not ready for that step, but I think it is important to be ready to go that far with it because ... not speaking the word out loud isn't really going to help anything.
