Agree. Arrogant is Biblically correct, except for the adultery question. Jesus did say that adultery was the one sin that breaks the covenant. Although the injured in the couple is always free to forgive the adulterer and continue in the marriage, but is not obligated to.
I presume that you're referring to Matthew 5:32 ... and simply note that the Catholic Church disagrees with your interpretation thereof.
Silverleaf asked about why the Catholic Church does certain things, particularly regarding marriage. Any answer to that must reflect how the Catholic Church understands marriage and again how the Catholic Church interprets any Scripture referring to marriage.