The answer hinges on gender.
About 75 percent of marriages survive if the male is cheating, and about 65 percent survive if the female is having an affair. Marriages in which males cheat are more likely to survive, therapists say, because men are less likely than women to have an emotional attachment with their mistresses.
And:
In a five-year study involving more than 500 people, the stress associated with a cancer diagnosis led to a separation or divorce 2.9 percent of the time if the husband was diagnosed, and it led to a separation or divorce 20.8 percent of the time if the wife had cancer.
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