I'm gald to hear he has been neutered and does go to the vet, I guess that something. Like you said though, it not the care a pet should have.

I still feel next time you see her just nicely ask her "Hey what are your plans for the cat after you move?" I understand about having neighbours from hell, I had a few in my time, but if you know she moving wait till it get closer to her moving date then talk to her. This way if she is one of those kind of neighbours, you wont have to deal with it long.

I'm sure you'll worry about the poor thing if you don't know what happens to him. Right?

Hope it all work out for him.