Is a married man who talks to girls over the phone or chat considered unjust to his wife and held accountable for that? And is a girl who talks to a married man considered unjust to his wife, even if her intention is to marry him? What is the ruling on a wife's supplication against a girl who causes the ruin of her home due to these conversations?

A man who engages in illicit relationships with foreign women is unjust to himself and his wife. A woman who engages in an illicit relationship with a man is unjust to herself. However, it is not permissible to supplicate against a specific sinner unless he has committed an injustice, in which case it is permissible to supplicate against him to the extent of the injustice. It is permissible to supplicate that Allah may ward off her evil and turn her away from the husband.