Two become one flesh for a life time experience. A commitment to love ones mate is possible on the same bases as a baby that is brought into a home. The baby is loved even though the child is self centered, keeps the parents awake, and needs diapers to be changed. In the same way a dog is brought home and loved. It barks, it is dirty, and it needs to be taken for walks in all types of weather.
Love develops on the good points.
The bad points with their experiences are forgiven, forgotten, and ignored. Therefore, they are not two any longer. The Christian wife should not leave or be put out by the Christian husband since God has made them one flesh for life. The Christian should not leave since God may use them to convert the unbeliever. God compares Christ to the Church with a marriage of a man to a woman.