Hey! Maybe they haven't left yet because we are doing so great at DB'ing!!
I'm totally convinced too that the A is an addiction; like you said - a rush. The problem is that the longer it goes on, the more long-term damage that is done. My H actually asked me recently if I thought that I would be able to get over the A and learn to trust him again. Now that is definately futuristic thinking since the A is still going strong! Let's not put the cart before the horse.
Another question - why do they act like they still need to cover up the fact that they talk? and lie about meeting when confronted? I know about the A and have access to the cell phone bills. Can't they just stop lying??