The Bible says that God caused Adam to fall into a deep sleep, and then the Great Physician did some creative surgery. “He took one of his ribs, and closed up the flesh in its place. Then the rib which the Lord God had taken from man He made into a woman, and He brought her to the man. And Adam said: 'This is now bone of my bones and flesh of my flesh; She shall be called Woman, because she was taken out of Man.' Therefore a man shall leave his father and mother and be joined to his wife, and they shall become one flesh.” (2:21-24) God had made two from one, and by revelation, Moses wrote the precedent for the future of mankind -- a man shall leave father and mother and he and his wife shall become as one.
God's will has always been unity in marriage, not two people living together and having totally different and separate lifestyles. The KJV says in Genesis that the man “shall cleave unto his wife.” This means to be fastened or glued together. Obviously the two have different responsibilities and cannot always be together physically, but they are to always be in unity together; likeminded in their goals and purpose. Believers are also to cleave to God. “That thou mayest love the Lord thy God, and that thou mayest obey his voice, and that thou mayest cleave unto him: for he is thy life, and the length of thy days.” (Deuteronomy 30:20 KJV)
“Two are better than one, because they have a good reward for their labor. For if they fall, one will lift up his companion. But woe to him who is alone when he falls, for he has no one to help him up. Again, if two lie down together, they will keep warm; But how can one be warm alone? Though one may be overpowered by another, two can withstand him. And a threefold cord is not quickly broken.” (Ecclesiastes 4:9-12) When a husband and wife are in agreement in their walk with God, that makes a three-fold cord, so to speak, and like a braided rope, it is not quickly broken.
In Eden, there was no confusion of roles. Eve knew her role, Adam knew his. Because of the clarity in their relationship and their unified purpose, there was harmony, which is what the adversary has worked to destroy in marriages ever since. When God's truth prevails, there is personal integrity, transparency and open communication. No stress, no secrets, no confusion.
Jesus taught the Genesis truths of marital unity, recorded in Matthew 19:4-6 and Mark 10:6-9. Jesus taught that hardheartedness led to allowances in the law for divorce, “but from the beginning it was not so.” (Matthew 19:8) As Malachi 2:14 teaches, “she is your companion and your wife by covenant.” God discourages division, and always encourages unity. Unity takes effort, sometimes hard work, but the results bring God's blessings.