But it's not that simple. Because entering into marriage isn't like owning a dog, where we're fined if he fouls the footpath or chases the neighbours chicken's. There, all the legal and moral responsibility belongs to the owner, and none to the dog. But marriage is an agreement between two equal partners who come together to make promises to each other as the basis for their love. And the marriage vows aren't something extraneous to the relationship, but define the very meaning of love.
Love is to be faithful, trusting, open, forgiving, humble, kind, self-giving.
There isn't any other kind of love. For a marriage to be a marriage, it has to be a union of committed, mutual loving. Vulnerability is what it's all about. Those who want revision often think this New Testament view of marriage is for some ideal world, not the real world of the 21st century where people live longer, complicated lives. But there never was an ideal world.