youre right, the show really changed after rita died...lol.....
having someone move in really does change the dynamics but from what you are saying, most of them are good,,,,except for your lack of personal space. you just have to find a way to carve that out. maybe when he is at work find a way to be really mindful of that time away from him and enjoy it, even if you are doing something else. if your free hours are together take some time to yourself by taking a bath or going into the bedroom to read or do some puzzles. just tell him you need and hour or so to yourself. take care.