KAW - I agree with Jethro, I would edit the letter some.
You're trying to say "I'm done. I'm moving on, this is unacceptable to me, I did everything I could to try to save our marriage, I give up now." But then you water it down with all these maybes about the future.
it's okay to say something to let her know the door may still be open a crack, but only very subtly - when you put in as much as you did, it starts to sound like you aren't serious and are only trying to get a reaction out of her.
