[nashashmi]

> How about the possibility that they are tired of their partner?

Then that goes to point #3. People who are "tired" of their marriage are the type who have little patience, persistence, hope, tools to fix their marriage. That is why they keep divorcing, because they can never feel complacent with what they have.

As far as the insecurity goes, it is like a pandora's box where all ills are born. They don't just affect marriage. They affect everything.