However, in Eastern theology, the mystery of marriage is “A great mystery is being celebrated. How is it a mystery? They come together, and the two are made one. They have not become the image of anything earthly, but of God Himself. They come in order to be made one body; behold the mystery of love!” (St. John Chrysostom, Homily 12 on Colossians).
The married couple are the icons of the marriage of God and Israel, Christ and the church and as such, we have no "til death do us part" in the ceremony. In fact, early on, the bride and groom simply took communion together and that was the wedding. They partook of the Holiest Mystery of the Eucharist. The couple was married on the footstep between heaven and earth, with the Body and Blood of Christ as their first meal.
Fr. John Meyerdorff writes.
The Byzantine theological, liturgical, and canonical tradition unanimously stresses the absolute uniqueness of Christian marriage, and bases this emphasis upon the teaching of Ephesians 5. As a sacrament, or mysterion, marriage reflects the union between Christ and the Church, between Yahweh and Israel, and as such can be only one—an eternal bond, which death itself does not destroy. In its sacramental nature, marriage transfigures and transcends both fleshly union and contractual legal association: human love is being projected into the eternal Kingdom of God.