I'm thinking about divorce. What does the Church say about it?

Jesus said, "what God has joined together, no human being must separate" (Mark 10:9). The Church recognizes that civil divorce is needed in some circumstances, but teaches that it does not dissolve the marriage bond before God. Even where divorce is tolerated, it does not free the spouses to remarry.

Cardinal Levada's glossary defines divorce as the claim that the indissoluble bond validly entered into by a man and a woman is broken. A civil dissolution does not free anyone from a valid marriage before God, and remarriage would not be morally licit.

If you have sufficient reasons for a civil divorce, pursuing one may be morally permissible. But it would not allow you to remarry unless, for example, you sought and received an annulment showing your first marriage was invalid.