Marriage is not God's will for everyone. Fullness of life is offered to all, both single and married. 8.2.3 Christian marriage is a union in Christ whereby a man and a woman become one in the sight of God. It is the commitment of two people to love and to support one another faithfully for life. God's law forbids adultery.
Loyalty is necessary for the growth of love.
Disloyalty destroys the union of marriage. Sexual union in marriage is intended to provide mutual joy and comfort as well as the means of creating new life. 8.2.4 Parents in caring for their children are mediators of God's love and discipline. They are called to raise their children within the covenant community, to be faithful to vows taken at Baptism to nurture them in the Faith by teaching and example. When we fail each other as parents or partners, we are called to forgive each other as God forgives us, and to accept the possibilities for renewal that God offers us in grace.