What God has joined together, let no man put asunder. He startled his listeners by insisting that a wife too had rights that are violated by a husband's infidelity. The letter to the Ephesians gives us the climactic biblical passage on marriage. He set no limits to his love, laying down his life that they might live. Thus marriage is also a covenant, a sign or sacrament of Christ's endless, self-emptying love.
Christian marriage is a pledge of life-long love and fidelity.
Christians, as children of God, make this pledge before God. God in turn seals the covenant between them and makes them a promise. He will be present to them throughout their lives, loving them as individuals and as a couple. Through his holy Spirit he will provide them with the resources they need to be faithful to their pledge. Clearly it takes freedom, maturity and faith to enter into a covenant of this sort.