Tell your W "yes you are right that they should be at home with the happy parent. When are you leaving?"
Stand your ground. She says she is unhappy, then she should leave. Tell that you're perfectly happy and that she is more than happy to go. Tell her that just because you don't agree with her to separate, doesn't mean that she has to stop doing what she feels she needs to do.
She wants to make it "mutual" so that she doesn't feel any of the guilt. Don't back down.
M-43 W-40 2D - 9 and 5
Emotion, yet peace. Ignorance, yet knowledge. Passion, yet serenity. Chaos, yet harmony. Death, yet a new life.