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Roman Catechism
Fidelity
The second advantage of marriage is faith, not indeed that virtue which we receive in Baptism; but the fidelity which binds wife to husband and husband to wife in such a way that they mutually deliver to each other power over their bodies, promising at the same time never to violate the holy bond of Matrimony. This is easily inferred from the words pronounced by Adam when taking Eve as his wife, and which were afterwards confirmed by Christ our Lord in the Gospel: Wherefore a man shall leave father and mother and shall cleave to his wife and they shall be two in one flesh. It is also inferred from the words of the Apostle: The wife hath not power of her own body, but the husband: and in like manner, the husband hath not power of his own body but the wife. Justly, then, did the Lord in the Old Law ordain the most severe penalties against adulterers who violated this conjugal fidelity.
Matrimonial fidelity also demands that they love one another with a special, holy and pure love; not as adulterers love one another but as Christ loves His Church. This is the rule laid down by the Apostle when he says: Husbands, love your wives as Christ also loved the church. And surely (Christ’s) love for His Church was immense; it was a love inspired not by His own advantage, but only by the advantage of His spouse.