I wrote a letter and sent it. He never responded. I did feel some better after I sent it, but I kind of wish I had waited a little bit. I was a little emotional when I wrote it. I think writing a letter is a wonderful idea though whether you send it or not.
edited to add:
I just went and re-read it and it is very tame compared to what I thought it was. LOL. I kind of wish now I had expressed myself more and expressed the hurt and anger more. I don't know. It's such a hard thing to go through.