There was also the hard hearted escape clause. If the wife's heart has hardened beyond any possible change, the husband can write the wife a letter of release from the M and put her on the curb.
Adultery was not the only just cause. And yet, folks here have stood for their M fully knowing of adultery and being the daily victim of a hardened heart. Nothing in the Bible says one is required to endure this situation, nor does it say we should not. Turning the other cheek is great when one is allowed to do so.
I recall that a man taking the divorced wife back is an adulterer. The first M was recognized and sex outside that M is adultery. Laws were simple and basic with little room for appeal. If things were that way today, who knows?
Some laws were not written as mutual. The man was allowed to write a letter of release to the woman, as I recall.