Gen. 2:18, 21-24The Lord God said, 'It is not good for the man to be alone. I will make a helper suitable for him'...and while he was sleeping, he took one of the man's ribs and closed up the place with flesh.
Then the Lord God made a woman from the rib he had taken out of the man, and he brought her to the man. The man said, 'This is now bone of my bones and flesh of my flesh; she shall be called 'woman,' for she was taken out of man.' For this reason a man will leave his father and mother and be united to his wife, and they will become one flesh.
God made marriage right from the beginning because He knew it was better for us to be together. God gives us an entire handbook about living our lives for Him and the power and strength He can supply within our marriages. It's simply...the Bible.