It's wrong to not take someone at their word.
After arguing about his continued friendship with an ex, Frank promises his wife Jan that he will cut off contact with his ex.
Jan wants to make sure Frank will keep his word.
Jan makes it clear how hurtful the situation was to her and her hope that he won't put her through that again.
Jan insists on monitoring Franks phone and email for a few months to make sure he cuts off all contact.
Frank is able to recognize the impact of his actions and so is able to keep to his promise.
Frank is hurt by Jan's lack of faith and their relationship suffers as a consequence.