one or both parties had a mid-life crisis, tried to reinvent themselves to assuage their existential angst, divorced, utterly alienated their partner in the process and ended up bitterly regretting it.
I seem to recall a study that showed many partners were much happier with each other after the pressures of marriage were removed from their relationship. I think there is a strong argument to be made that the actions and later regret of those people you refer to is a direct result of having no "escape hatch" in marriage. Destroying everything you have is often the only way out, even if it would have been prudent for the couple to just end the marriage and keep the relationship. But that brings us back to the parent's point: Who ends a marriage to increase the happiness of the relationship? Nobody. Divorce implies an end.
I seem to recall a study that showed many partners were much happier with each other after the pressures of marriage were removed from their relationship. I think there is a strong argument to be made that the actions and later regret of those people you refer to is a direct result of having no "escape hatch" in marriage. Destroying everything you have is often the only way out, even if it would have been prudent for the couple to just end the marriage and keep the relationship. But that brings us back to the parent's point: Who ends a marriage to increase the happiness of the relationship? Nobody. Divorce implies an end.