Marriage is permanent. It is to be maintained up until death itself. The commitment is for a lifetime. It is never to be desolved. It is never to be defiled. Divorce is not an option.
Because of this, it ought to be guarded carefully. A husband and wife ought to be alert and careful about relationships with the opposite sex. There is no room for a husband to have a meaningful relationship with a woman apart from his wife. Unfaithfulness is nothing to be toyed with (Hebrews 13:4).
Some may say that a permanent marriage is unrealistic today. They might argue that people change, and as change takes place marriage may need to be terminated. However, marriage is grounded in commitment, not "compatibility." Remember that in marriage, the greatest pleasure will not be found simply in common interests or activities. Great joy is to be found in pursuing the happiness of your spouse, and putting her before yourself.