Trader, is your story fiction? I know a couple like this who lived in my sister's neighborhood. They were always together, always happy, always at the local arts and crafts festivals together. A few years ago, she was diagnosed with Alzheimer's. This darling man dressed her, applied her make up, made sure her hair was fixed, and treated her like a living doll. He was always extremely patient with her. She'd been so full of life, it was very sad to see her ravaged by Alzheimer's. Not long ago, she passed away.
I don't think there is any more cruel disease than Alzheimer's. It strips away a person's soul and leave a shell behind.