Infidelity is an extremely difficult issue for couples, but numerous studies show most get past one partner's affair and stay married. Approximately one marriage in five where there's been an episode of infidelity comes to an end as a direct result of the extramarital affair. For some, the crisis that erupts after the discovery of an affair becomes an opportunity for the renewal of commitment between husband and wife. This is most likely the case when the affair becomes the catalyst for marriage therapy, where underlying issues can be brought out into the open and addressed.