Praise be to Allah.
It is obvious that there has been a misunderstanding between this man and his wife’s family, and that they want him to divorce her. It is essential to find out the wife’s point of view. If she wants a divorce then he has to try to change her mind by tackling the cause of the problem. Otherwise he may divorce her, and perhaps Allaah will compensate each of them with someone who is better than the other. He should however, avoid discussing the issue of her betraying him. But if his wife does not want a divorce then he should treat his wife well and seek refuge with Allaah from the accursed Shaytaan, and he should not pay any attention to the doubts for which he has no proof. The Prophet (peace and blessings of Allaah be upon him) said that there is gheerah (protective jealousy) that Allaah loves and there is gheerah which Allaah hates. The gheerah that Allaah loves is gheerah which is cause for doubt, and the gheerah that Allaah hates is gheerah when there is no cause for suspicion.