"I always thought we would be friends and now you don't even want that. I can't understand how you go to always returning my calls to not talking to me at all, even when I call you. It just makes me really sad to lose you as a friend."
Why, whyyyy would she think that you would be friends after that? It's not like it's a social norm for divorcing people to be friends? I think you should burst that bubble there.
She wanted to get divorced so let her have it.
Accept that there is only one thing you can change in life and that is you
