If her friend gets a divorce, your wife is 75% more likely to divorce[Pew research]Watch
Sociologists call the phenomenon “social contagion”—the spread of information, attitudes and behaviors through friends, families and other social networks.
Examples of social contagion run the gamut from adolescent sexual behavior to the spread of phantom diseases in a workplace. Economist Ilyana Kuziemko reported in a 2006 paper titled “Is Having Babies Contagious?” that brothers and sisters are significantly more likely to have a child soon after a sibling gives birth."
Also, it's worth noting that the demographics of the study were those of middle or upper class white people, whose divorce rate was/is the lowest amongst the general populace. That means that a lot of these marriages may have been deeply unhappy (eg 1950s are notorious for this), so of course a man/woman who would learn from their friend that life continues after a divorce would think that maybe they don't have to put up with their husband's possible abuses. Again note the use of "wife" in the title, another misinterpretation!
Overall, pretty interesting study. But nothing that I didn't know or suspect. Divorce is always preferable to a deeply unhappy marriage fraught with emotional or physical abuse.