I never thought of leaving or not caring for her, just as I am sure she would have never left me if I was in the same situation. Was this because of a deep love, a result of thirty years spent building a life and habits together, civic and marital duty or some combination of all of these? The thought of not caring for someone in her situation so close to me is anathema.
Concerning diseases that reduce ones mental acuity; every time she would lose the ability to speak or understand, it was crushing. She would often regain some functionality, but each time something was lost. In her final days, she would sometimes regain consciousness and speak to me, but couldn't understand what she was saying. This is/was one of the most distressing things for me to experience. I often sit and wonder what it was she wanted to tell me and how I will never know.