I do genuinely forget some of his preferences - he likes one of the downstairs doors left open at night, the other open - so the cats can move about the house but not get into the kitchen. He's probably told me a hundred times. And I still genuinely forget - but he seems to believe that I do it on purpose.
Is there maybe a nice way that you can help remind yourself? Maybe some sticky notes on cute paper or something taped up in certain places. That way he can see that you are listening and taking him seriously?
