I didnt write a letter, but what I would say is just to write whatever you want to...everything you feel. Just get it all out. After that you can go back and edit what you shouldnt send.

My situation was similar to yours in that I wanted the divorce, not him. I remember the fear and sadness when I finally admitted to myself what I had known for so long..that I didnt love him anymore. I couldnt stop crying. Although leaving was the best thing for both of us, it still broke my heart. I knew he didnt want me to go (although he did nothing to help make things better) and that tore me up.

You say he has a temper...mine does too. If you send the letter just be prepared for him to not receive it well. I know you just want closure, but if he is looking at the situation anything like mine, he is feeling angry and jilted by you. My ex resents me for walking out and all I get now is anger and bitterness, no matter how civil I try to be.

In answer to your question...yes, it is going to get better.