Sounds like this is a move that is long overdue. Hoping for peace for you. Going by the way she seems to rationalize things, it sounds like you need the space. Sending strength.
You know you've done the right thing. Four years is a long time to wait for true reconciliation. I know that it is hard, but sometimes letting go is the only path to peace.
Me - 36 BS
Him - doesn't matter
I have a WW who has refused to own up to her VLTA. A divorce would cause our kids a lot of pain, but she is solely responsible for the actions that destroyed this marriage. I intend to visit a divorce lawyer, soon.