Jesus re instituted marriage as a Sacrament, the same status it had with Adam and Eve. Therefore marriage is permanent, so if someone remarries after divorce, that person is considered to be in a state of adultery. "Every one who divorces his wife and marries another commits adultery, and he who marries a woman divorced from her husband commits adultery" (Luke 16:18; cf. Mark 10:11–12).
"Thus a married woman is bound by law to her husband as long as he lives. . . . Accordingly, she will be called an adulteress if she lives with another man while her husband is alive" (Rom. 7:2–3).
Despite popular culture the Catholic Church in that past and present stands firm in its denial of Divorce. A Divorce is only allowed if the marriage was never consecrated, which means the two parties did not exchange matrimonial consent, and it is annulled.
If, however,
the parties are genuinely and sacramentally married, then, while in some cases there may be good reasons for them to live apart and even to obtain a legal separation, in God’s eyes they are not free to remarry (CCC 1649).
"To the married I give charge, not I but the Lord, that the wife should not separate from her husband (but if she does, let her remain single or else be reconciled to her husband)—and that the husband should not divorce his wife" (1 Cor. 7:10-11).
"No temptation has overtaken you that is not common to man. God is faithful, and he will not let you be tempted beyond your strength, but with the temptation will also provide the way of escape, that you may be able to endure it" (1 Cor. 10:13). This text means that God gives us Sacramental aid in our dealings.