catching up in pieces, so this may be discussed already and I'm sure I'll add more later.
First, gypsy is so correct that praying for stbx and sending him good wishes really does help your mindset. I thought she was crazy too when she suggested it to me, but it is very helpful in working through the anger and resentment.
However, as naej pointed out, you can only forgive on your time table. You'll be ready to one day and it may be that day is a long time in coming, but someday, you'll see you need to forgive him and let it all go.