@The Pentacle Queen,
Well said/written. The act of getting married shouldn't change the relationship, but alas, it seems to do just that and FAR too often. Some people feel trapped and at times can act like 'caged animals' when things go wrong. {If people would only have less children..but that's another rat-hole.}
Loyalty and 'proper committed couples behavior' is no guarantee just because a civil official or minister-priest-rabbi draws up a paper or performs a ceremony.
The behavior of masses around the contract of marriage has been changing for the last 40 or so years. For better or worse (in sickness and health), the effect of progress and social changes is far reaching - change such as more women in the work world (more independent financial security) effective birth control along with legalized abortion and greater social acceptance and respect for single women and single mothers. Perhaps divorce is far less of a stigma than ever, so multiple marriages seems to be a by-product?
oh nuts, I rambled off point...
Can the social result (of all these changes) be more multiple marriages depending on the stage of one's life? My guess is ... yes!