She doesn't live with him. He lives in an apartment but he owns the marital home which she rents from him, the plan was until she got her own place.
Then I think Gabriel was either going to move back in to the marital home after she has moved, or sell it - or if they had got back together, then they would all just live there like before.
I think what Gabriel meant was that he is just fed up of being her landlord when they are D and she's not making any effort, and he wants to cease this role in order to move forward with his life.
