What happens when a marriage heads for the rocks?

A marriage is a whole greater than the sum of its parts, but only the two people who make it know it and only they can steer its course. It is simply not true that a marriage headed for trouble is inevitably doomed. Many marriages veer dangerously close to the rocks but manage to avoid them. A marriage is not a separate entity; it consists of two people, who still retain thoughts, feelings, and ideals, even though they are married. They can control the marriage. They can make rational decisions, which will be better in the long run than decisions made in the heat of anger or the darkness of despair.