I'm just not convinced his heart and mind are all-in on his claimed course of action. He may not even realize that himself. He may have something like an addiction even, and without a clean break, there will be no end (for him) and torture (for both).Kindness in the face of adversity because you simply can is a strength, a choice simply because you can when the path is clear.
Keep your apartment, continue to be compassionate knowing that your heart is being healed on the inside as well as the outside.
There will be times when you will be challenged over many things in the upcoming divorce, having even a small presence will allow you to keep an eye on the state of things and begin sorting out while ensuring and maintaining the upkeep of things there... stay a couple days a week just to ensure a smooth transition is not a bad idea, retreat to the peace of your apartment when done.
Your heart and mind do not have to be hardened, they just have to understand the purpose and right effort.