Pray that your husband will safeguard his heart against inappropriate relationships with the opposite sex. Pray that his heart will be pure and undivided in his commitment to you.
Scripture for Prayer and Meditation
For the commandment is a lamp and the teaching a light, and the reproofs of discipline are the way of life, to preserve you from the evil woman, from the smooth tongue of the adulteress. For the price of a prostitute is only a loaf of bread, but a married woman hunts down a precious life.
But put on the Lord Jesus Christ, and make no provision for the flesh, to gratify its desires.