The marriage tie can be broken only by death (Rom. 7:3) or fornication. Hence, to have a divorce for any other reason is to commit adultery.
But I say to you that whoever divorces his wife, except for fornication, and marries another, commits adultery; and he who marries her who has been divorced commits adultery. (Matt. 19:9)
So then if, while the husband is living, she is joined to another man, she will be called an adulteress; but if the husband dies, she is free from the law, so that she is not an adulteress, though she is joined to another man. (Rom 7:3)
According to the word of the Lord Jesus, the only cause for divorce is fornication. Only two things can break the marriage tie: either the death of one of the parties or fornication, adultery. If either party commits adultery, the marriage tie is broken. This is the principle. Therefore, the Lord Jesus said that there must be no divorce except in the case of fornication. But you should not take advantage of this as an excuse to remarry simply because an act of fornication has been committed. This also is a matter of motive. If possible, the offending one should be forgiven. However, it is different if the guilty party refuses to repent and lives in that kind of sin or marries someone else. In such a case as this, the marriage tie is broken, and the other party is free.
