One word: prenups.
Getting a pre-nup is NOT a sign of a lack of trust. A friend's mother literally went insane from a mental illness, but before she got so insane that she could be forced into a mental institution, her husband divorced and she ruined his finances. Always get a prenup, if no other reason than for the possibility of literal mental insanity. These were conservative committed Christians BTW.
I don't suppose he swore this oath about "in sickness and in health; in good times and in bad..."