I am guessing the man is probably just as mentally unstable as she is and they both need serious help.

I will have to see if I can find the link but I read one story about it saying that he brought her food and drink and he sponge bathed her because she refused to get in the tub.

I can see not calling for someone if she just wouldn't come out of the bathroom (especially if he is a little off himself) She was refusing help and perhaps he was just obeying her wishes who knows. I think they just need to get them both some mental help.