This is a willing subjection, a loving subjection. It can be a willing subjection because Christ loves and saves the Church. By His life giving Spirit, He keeps His Church alive, consoles Her, embraces Her and protects Her. Genesis 2 teaches that marriage involves becoming one - physically, emotionally, spiritually. Because this is true of Christ and the Church.
Scripture teaches that marriage is a permanent bond, broken only by death.
Simply because there is a permanent cleaving of Christ to His Church. Even when there is unfaithfulness on the part of His people, He always brings them back. This is why, in marriage, the wife is not the husbands equal. Genesis 2 shows that woman was taken out of the side of man, is his helper, fit for him. This is not to say that woman is not a glorious creation.