But if the unbelieving depart, let him depart. He that loveth his wife loveth himself. The woman answered and said, I have no husband. That's it for now. Marriage is a duly-recognized covenant relationship entered into by a single man and a single woman.
Marriage lasts until one spouse dies.
Even after a divorce is forgiven the original marriage exists before God. To remarry while the first spouse is still living is contrary to the will of God. Remarriage is an act which God forgives upon repentance. Remarriage is a state which must be abandoned. Being divorced is not necessarily sin.