IV. Offenses Against the Dignity of Marriage

From The Catechism of the Catholic Church

2381
Adultery is an injustice. He who commits adultery fails in his commitment. He
does injury to the sign of the covenant which the marriage bond is,
transgresses the rights of the other spouse, and undermines the institution of
marriage by breaking the contract on which it is based. He compromises the good
of human generation and the welfare of children who need their parents’ stable
union.

PART THREE: LIFE IN CHRIST

SECTION TWO THE TEN COMMANDMENTS
- CHAPTER TWO YOU SHALL LOVE YOUR NEIGHBOR AS YOURSELF
  - Article 6 THE SIXTH COMMANDMENT
    - IV. Offenses Against the Dignity of Marriage

From The Catechism of the Catholic Church – rosary.team