The union of a man and a woman as husband and wife according to the standard set out by God. Marriage is a divine institution, authorized and established by Jehovah in Eden. Marriage brings into being the family unit, the family circle. Its basic purpose was the reproducing of the members of the human family, to bring into existence more creatures of the human kind. Jehovah the Creator made male and female and ordained marriage as the proper arrangement for the multiplication of the human race. (Ge 1:27, 28) The first human wedding was performed by Jehovah, as described at Genesis 2:22-24.
Marriage was designed to form a permanent bond of union between man and woman, that they might be mutually helpful to each other. Living together in love and confidence, they could enjoy great happiness.
(Matthew 19:6) "So that they are no longer two, but one flesh. Therefore, what God has yoked together, let no man put apart.”
That's why couples vow "til death".
God made arrangement for dissolution of marriage only if adultery is involved. (Matthew 5:32) "However, I say to you that everyone divorcing his wife, except on account of sexual immorality, makes her a subject for adultery, and whoever marries a divorced woman commits adultery."