Is a person punished who reveals a husband's marital infidelity to his wife, and is he punished by God if he informs the wife so that she may be cautious and prevent the continuation of such relationships?

Whoever becomes aware of an illicit relationship between a man and a woman should gently and kindly advise them to end the relationship and repent. If they persist, he should threaten to expose their affair. If they still do not desist, he should inform someone capable of stopping them from committing the wrongdoing.