Cohabitation didn't save you. Look at all the studies, cohabitation plays a part in divorce, for the whole time one is "getting the milk", or living with someone, they really haven't grown deep enough in a relationship to know whether they are right for one another. That is, they have placed a sexual element or lust, mind you, into the equation that the values, beliefs, true growth, etc., things that allow for a marriage to survive, are overshadowed. Hence, just as when premarital sex is occurring, cohabitation with premarital sex is a recipe for disaster, as people become "blinded by lust".
While the number of people who are engaging in premarital sexual relations occurs in large numbers of non-cohabitating individuals, the percentage of of premarital relations is higher among cohabitating individuals and, hence, a higher divorce rate.
So, MOST LIKELY TO STAY MARRIED: Non-Cohabitating/Non premarital sexaul relations.
LESS LIKELY TO STAY MARRIED: Cohabitating/Non-premarital Sexual relations
Even Less Likely to Stay Married: Non-Cohabitating/Premarital Sexual relations
LEAST LIKELY TO STAY MARRIED: Cohabitating/premarital Sexual Relations.
You certainly spend a lot of energy being concerned about the sexual habits and living arrangements of adult people who seem to not be related to you. Do you find this preoccupation a little odd? Have you discussed this problem with a professional, sounds like you need to get through something in your own life. To me it seems like you might threaten to hold your breath until you turn blue if we don’t acknowledge your rant.