It is a betrayal of one's own sense of morality to divorce a spouse suffering from Alzheimer's for the selfish needs. Most of us are built to feel a sense of guilt, remorse and repentance and not walk away from a non-benefit giving spouse, by extension, would one dump God in distress? What if it was the man, wouldn't the wife stick with him? Didn't Nancy Reagan stick with President Reagan? Betrayal is an exception and not the rule; a majority of people regardless of their faith do not take that option and in turn find their worth in serving the loved one.
When my late wife was unable to do personal chores during her cancer treatment, I volunteered to do it for her; instinctively she refused and was not comfortable, but accepted it on the same argument. Would you do it for me if I were in your shoes? The bonding reward is something I would cherish for a life time and I have discovered hundreds of men and women rejoicing the same.