Hi KGirl, I have had some of the same issues. WAH posted photos of his new house on FB and some of my friends (mutual friends, but really my friends) commented congratulating him/us. I wondered, should I email them and say I didn't move, he did...? I just did not feel like it so I let it go. Eventually someone told them.
If you want to post pics of your cat, do so. When/if people comment you have many choices. 1. ignore the comment (like the comment if you want but don't answer it) 2. message the person directly 3. say something about H being with the other cat
And you can make these choices for each individual. When I saw one friend liking and commenting on WAH's facebook, I sent her a message telling her the "news" because she was MY friend and I knew she would want to know. What did she do? Immediately deleted her comments and unfriended him. ha.
So it's up to you but I say just go about your business and don't worry too much about the comments and questions. You can ignore them. If people are really wondering they will contact you directly.