IF: CCC #2382 teaches:
The Lord Jesus insisted on the original intention of the Creator who willed that marriage be indissoluble. He abrogates the accommodations that had slipped into the old Law.
AND: CCC #2384 teaches:
Divorce is a grave offense against the natural law. It claims to break the contract, to which the spouses freely consented, to live with each other till death. Divorce does injury to the covenant of salvation, of which sacramental marriage is the sign.
AND: CCC #2385 teaches:
Divorce is immoral also because it introduces disorder into the family and into society. This disorder brings grave harm to the deserted spouse, to children traumatized by the separation of their parents and often torn between them, and because of its contagious effect which makes it truly a plague on society.
AND: CCC #1790 teaches:
A human being must always obey the certain judgment of his conscience. If he were deliberately to act against it, he would condemn himself. Yet it can happen that moral conscience remains in ignorance and makes erroneous judgments about acts to be performed or already committed.
AND: CCC #1791 teaches:
This ignorance can often be imputed to personal responsibility. This is the case when a man takes little trouble to find out what is true and good, or when conscience is by degrees almost blinded through the habit of committing sin. In such cases, the person is culpable for the evil he commits.
AND: CCC #1792 teaches:
Ignorance of Christ and his Gospel, bad example given by others, enslavement to one's passions, assertion of a mistaken notion of autonomy of conscience, rejection of the Church's authority and her teaching, lack of conversion and of charity: these can be at the source of errors of judgment in moral conduct.