Married fast? Too late? Completely stuck :/

[Complex]

So I also wrote her a letter which I didn't send yet. I wonder if the timing is right.
I thought she might be a little more 'open' since she told me she missed me over the Christmas time so I can get through. But maybe I should just shut up and detach more, GAL and evaluate how she is dealing with everything now since I left for my vacation.

Here is the letter. I tried to keep it factual without blaming and showing more understanding and agreeing.
Intention of the letter is to make her feel I really understand now and that I'll move on with or without her. Then I basically want to go dark a bit and let my actions speak.

Should I send it or wait or does it even sound ok? Probably good to have an outside opinion:

Hi.
Just wanted to get some things straight before I come back.
I feel much better about everything. It was good to be gone for a while. Had a lot of time to think straight.
You were really right about the lacking deepness of our relationship. We got married too fast without really get to know each other and then failed making a real effort but I suppose we were honest about marrying each other. Or maybe your doubts where big before already and didn't justify a marriage in the first place. Problem is how can I know after what happened and how it happened? I'm sure you know what marriage means. You did not respect me recently and neither have you been honest and open...same counts for me. I wasn't the man I should've been, seems like I was still on 'vacation' and then got unhappy too. We were both very immature. We hardly talked about our future, dreams and fears just to name a few issues. Mostly my mistake honestly. I remember you trying to connect early in the marriage and I was always like 'it's all gonna be fine'. I'm so sorry.
You also know what I did to my ex. Similar story between us. Not enough communication about feelings, needs etc., no ability and effort to create a better connection, so we could work on things together. That lead to dragging around unhappiness and then in my case to cheating. When you talked to me finally it was too late already, you were gone. Then the efforts were shadowed by my inability to deal with it. But honestly I don't know if I would've understand it without the experience of the last few months even if we would've done it right. And we are humans after all. I forgive you..and myself. Our marriage went from white to black, which was so weird. And because of that I don't know how to trust you anymore. I'm even still not sure if you cheated on me or not, or how much contact there was and still is, because you haven't been honest to me in a long time. I want to know the truth. I'm sick of being treated the way you treat me. You don't need to be afraid to hurt me, truth hurts a lot but it hurts way less long than lies. Damage is done and like I said I will forgive but I don't need you to tell me the 'friend forever' thing just to make me feel better naming me all various reasons why I'm not for you etc. You don't need to tell me anything to make me feel better if its not true. You also should stop feeling so guilty. It is what it is and we should adult up!
So the separation is fine. We can discuss how exactly we are going to deal with it and what we are going to do. It's not what I want to happen but I won't be in your way.

Thanks for your time and advice guys!!!