One question to clarify...
To change your behaviour, does this mean a conscious change of doing something different... maybe once or a few times... but not enough for the change of behaviour to settle as a habit? Ie... if you stopped consciously changing this behaviour, you will return to your old behaviour. Or does a behaviour change mean that you have completely changed to form new habits?
From my outside perspective, it seems BSs are afraid to transition from Plan A to Plan B, because of a belief. They BELIEVE they cant survive w/out WS, they will lose control of the situation, they are unworthy, etc.
This was an unconscious belief I held. I think it became a belief following an EA my W had 5 years prior to the PA. It was because of this unconscious belief that my behaviour changed during those 5 years. I felt I was treating my W like a queen, but in reality, because of this belief/fear, I was smothering my W. I was needy and afraid and showed it by doting 24/7. (We have 2 dogs... one was a stray that is really needy... always at our feet or watching us, just wanting to be loved. The other we had since a pup... she is more secure and is comfortable to go lie down or be on her own. Guess which dog is far more annoying!!! I was acting like that stray dog.)
This fear became a conscious belief following the PA... I even told the MC that I could never find another woman like my W.
When I realized the fear I had... I started to consciously force a change in my behaviour. I took a trip with the kids without her. I spent more time on my own. I was used to travelling for work, but it was a different feel... it wasn't my "choice" to be separate from her. And yes, I started looking at dating websites... I never emailed anyone... but I was discovering that there were a lot of desirable, eligible women out there looking.
Throughout this time, I was still afraid. My belief was still pulling me back to thinking that I couldn't live without my W. But eventually, through forced behaviours, this belief lost it's hold.
I know the fear left about 2 months ago when I told my W that I was going to leave. After a day or two, we talked calmly, holding each other, and discussing my plans to leave. We were both ok with that decision, but my W said not to leave yet, it was too soon. I stayed and our recovery has been moving along in leaps and bounds.
Since that time, my belief has changed, and now my behaviours have changed without conscious thought. Prior to that moment, I told myself every day that I would survive on my own... but it was still something I had to convince myself of... it was not a true belief. Since that day, some new habits of response have formed and they are no longer forced. My behaviours have changed.
So in answer to your question... I believe that we consciously change behaviours first, until our beliefs change... at which point, our change of behaviours can become permanent. The behaviour change, however, will not be permanent until the beliefs have changed. The beliefs must change or the behaviours fall back to old actions.
Shaden