In sickness, love lasts longer

There is a good article in the CNN Health, that in sickness, love endures.
In the article, a woman is ill and has hard time to walk. Her husband takes care of her well.
According to him, love can be developed not only the affection but also through commitment.
They have a lot of hard time together, so in the good times, they both feel happier.
I think that if a husband is busy to take care of his wife, he won't have time to cheat.
So the article can be true.
Also, if a spouse become ill and can't live by himself, some people can't be divorced. Maybe they are more likely to help their spouse, I think.