You could sit him down and say, “I have a problem with the way your home looks and I also don’t want to have a problem with your attitude not being in sync with mine, can you make that change or do you want to live somewhere else?”
I would also assume he cannot work for Seller and for you at the the same time. Does he want to live somewhere else or work somewhere else?
Then you manage as best you can until you think you can do better with someone else.
Personally, I’d start fresh though.