Wife no longer in love with me

[cam]

So I get home from work last night, ready to focus on DBing and GAL and there is a letter in the mailbox from W. Brief overview but goes something like this:
"I'm sorry for hurting you, but I need to do this for the best for both of us. We both need to move on, I started falling out of love with you last year- didn't you notice me running all the time and losing weight. We can't go back now, I could never bring children into a marriage like this. And I am moving back to the States at Christmas. You will always hold a special place in my heart, and I hope you find happiness one day. I admire that you've still been fighting for me, but I'm not coming back, you need to accept this. Our marriage wasn't even enough and we both should have worked on it, so it's not all your fault. I used to worship you and us, but I just see us differently now and it will never be the same and I will never get that feeling back.
there was a bit more but that's the gist of it.

I don't think any DBing will change this sitch now. I don't know what my next move is. I was ready to stop all contact and ignore her, but what's that going to do now. I won't respond to this letter.
I just feel beaten again, I can't take a trick. How did I marry someone so messed up that can walk away from a marriage so easily?
We had such a great friendship, love life, affection and bond. She is my best friend. As she didn't have a close network in australia we did everything together, every day and weekend. And now it's all gone.
If my crime was getting focused on work and being unhappy, then I don't think I'm the worst person in the world. She said she didn't feel pretty around me because I didn't always tell her. God, I loved her and thought she was beautiful, why does a 31yr old need to be told they are beautiful all the time??

Yes I can apply the DB principles to move on in my life, but my main objective was to get her back and my life with her. Its not to be. She will move home in 4 mths and then I will never see her again. Such a weird concept to get my head around.
I guess it's back to single life and trying to date again - I wouldn't even know where to start!
Geez I miss my best friend. Very sad today now. I wish I could change everything I wrecked in my life with my actions and behaviors.