"Marriage is honorable among all, and the bed undefiled; but fornicators and adulterers God will judge" (Hebrews 13:4).
Marriage is greatly dishonored when people live together without marriage, by same sex marriage and by unscriptural remarriage. Nevertheless, God commands that we hold marriage in honor. It is not biblical to conclude that every marriage is approved by God. John was killed after he told Herod it was "not lawful" to have his brother Philip's wife, "for he had married her" (Mark 6:17-18). Herod was in a marriage, but it was not sanctioned by God. It was not honorable; it was sinful.
Are you in an honorable, God-approved marriage? The Bible tells you. Jesus said marriage is for life; God joins the man and woman together (Matt. 19:4-5; Rom. 7:2). "Therefore, what God has joined together, let not man put asunder" (Matt. 19:6, 4-5). Jesus said putting away one's spouse for the cause of fornication is the reason for which one may end marriage and honorably marry another (Matt. 19:9). All other reasons for ending a marriage are sin and adultery is committed in remarriage (Matt. 19:9; 5:32; Rom. 7:3). Sexual immorality defiles the honorable marriage bed. God will punish all who do.