When you get married as a JW it is not a true marriage of two people. They include Jehovah as part of a "divine threesome" as it were. The problem is that "Jehovah" really equals the GB! Since marriage mates are told during the wedding talk that they are supposed to love Jehovah *ahem* (GB) more than their own spouse and children, this explains why marriages often crumble when one party finds out TTATT.
Like my wife, many buy into the idea that if you leave the TWOOF, this severs the agreed upon "threefold cord" and therefore the marriage is doomed to failure. I dont know how the rationalize how "worldly people" sometimes have happy marriages lasting decades when all they have apparently is a lousy two fold cord. Its just another facet of the deep tree root like system of mind control..