Hi John,
Welcome and congratulations on your sobriety.
I think you should allow yourself to feel the emotions you are feeling and then try to let them go. You are grieving over the loss of a 25 year relationship and grieving is a healthy process. Of course, it's a huge loss to you. It sounds like you know, logically, that this divorce is going to happen and that you cannot change that. I think if you just allow yourself a little time, you will accept it and be able to move on.
Be kind to yourself and I hope you keep reading and posting.