The WS never admits it, but they want to keep the WS around as a safety net... while they press the boundaries of the marraige gradually and watch the LBS fall apart. As long as the LBS shows a willingness to BE THERE the WS is going to explore the affair further and further.
Think of it like a high wire act in a circus... the LBS is the safety net and the affair is the tightrope the WS walks along...
Once you STOP being there... particularly by shutting your WS OUT of your life and they have no idea what you're doing or where you are going, the WS has to go back and check the safety net...
Allen, I think this is one of the MOST profound things I've seen you write - and you've written a lot of really, REALLY good stuff, LOL!
But why do they want to destroy the LBS and see them 'fall apart'? For ego?