1 Corinthians 7:10, Jesus commands the woman not to leave her husband and if she does she should remain unmarried, but in Malachi 2:10-16 the treachery that man commits against a woman which leads him to have an affair outside of the marriage or abuses the wife whether it be physical or emotional gives place to what was said by Moses in Deuteronomy 24:1-4 that if a woman is no longer pleasing to her husband then the husband should give his wife a written bill of divorcement and send her out of the house and this gives the woman the right to marry again, but she can never go back to her former husband if that marriage does not work out or her husband dies for now she is defiled to be with her first husband and this is an abomination to God.
For a good marriage to work one should study 2 Corinthians 6:14 be ye not unequally yoked together with non-believers for what fellowship hath righteous with unrighteous, and what communion has light with darkness. If you are a believer in Jesus Christ then you need to choose a mate that also believes in the faith of Christ. In some marriages people do not enter into a relationship with Christ being the center of it, but maybe one of them come to know the Lord and the other one refuses to have that personal relationship with Christ then we go back to what 1 Corinthians 7:12-16 says. If the unbelieving partner leaves the believing partner then this frees the believing partner from the bondage of the vows of marriage and they are free to marry again.
Before ever getting married take time to really know each other and establish a friendship that consist of trust and belief in each other. Allow Christ to be the center of your friendship and this will allow you to begin a marriage that is totally Christ centered. Always resolve your problems with the Holy Ghost guidance through the word and you will always have a good marriage. Always be opened and honest with each other for this builds trust in the relationship, but if that trust is broken there is no relationship. Love each other unconditionally as Christ loves us and forgives us our faults. As long as we live in this flesh we will sin at times, but when you acknowledge those sins and ask for forgiveness God will always forgive us. Always be ready to forgive each other seventy times seven, Matthew 22:21,22, and not only forgive, but forget the sin as God remembers our sins no more when we repent of them. The outside appearance will always change and beauty may fade, but it is the heart of the person we are to love and the heart will never change as long as the love of Christ dwells within it.