You don't know. You've never been married and divorced. Everything is insurmountable when you're married. The fact that you want to talk at the breakfast table and he insists on reading his paper is insurmountable. Leaving the seat up on the toilet is insurmountable. Getting peanut butter in the jelly jar is insurmountable. People don't change just because they're married. All those little habits and personality quirks that you previously thought were trivial become the bane of your existence. And the major problems, like different outlooks on life, are crushing.