I'm not expert so maybe puppy or someone can chime in but I would say you might want to not make things so easy for him. He is getting all the good of your marriage and has no consequences. He also needs to see you move on and that he really doesn't want to lose you. You can work on detaching and GAL and 180. What I have been told is to treat him like a friendly neighbor. You back off and let him come to you if he wants. Don't initiate conversations but listen when he wants to talk. Don't act pouty or rude just occupied. DO NOT discuss your R or D. Find things to do outside of the house.
Read some of the veterans posts in the archive they have such good advice. Especially the Nuggets from veterans and More Nuggets from veterans threads.
Me-38 W-44 D8 & D6 together '95, Wed '97, Bomb 11/18/08 Still in same house