Hi Oktober,
No stop sign, so will wade in for a little while.
I am not familiar with your story, but (there is always a but isn't there?) from what you had written, my initial thought was 'serial cheater in the making'.
Then you wrote:
Last time my BS carried the weight of reconciliation for both of us for so long.
Ding! Ding! We have a winner here folks!
From my limited viewpoint, even though you had gone through the motions of R, you were not vested in it.
The WS is the one that should be putting in the hard yards in any attempt at R. The BS also needs to do the work, but it was not the BS that screwed up the M, so it falls on the WS to do most of the work.
In R, the BS & WS need to be committed and receptive to R. This is the commonality for any chance at R. Without this, there is no R.
If you are truly committed to R, then you damn well better buck up, and do the work required.
YOU need to show him through your words and actions that YOU are going to hunker down and not lay-about like the last time.
There is no guarantee that your BS will take you back (sorry, channeling Capt. Obvious here), but you will still have to do the work, nonetheless. The outcome is not for you to control, it is purely in the hands of your BS.
At the moment, your BS is thinking 'Fool me once, shame on you. Fool me twice, shame on me'. His self-confidence is shattered (you took the proverbial sledgehammer to his ego), and he still had some glue left after your first A, so he rebuilt himself, and did the work to try and mend what you broke.
You broke it again, like a petulant child, because you probably felt entitled (very common behaviour nowadays), and smashed the M again, because you were not 'happy', but her has no glue left for the M. YOU will need to provide that now.
What you need is to get off your high, self-entitled horse, and start shovelling the sh*t that your horse has produced.
You say that you understood the hows and whys of how you got into your first A. Might be true, but you sure have a funny way of showing how you learn things.
A few things that you should look into doing now:
1. Leave your ego outside. Egos tend to get in the way of any constructive actions. Your BS is entitled to keep his ego, as it has been shattered, and is the one that needs to be re-built. Yours was the one that caused the trouble, so keep it out.
2. Change your attitude about R. You will need to want it also, and not be a passenger. You need to take on the pilot's seat, whilst your BS is the Captain, giving you orders as and when. You execute those orders.
3. Shields down. No walls. You have to be comfortable with being vulnerable. Even moreso now, as it is your second time around.
4. Do not be complacent. You got too comfortable, and forgot what you did. This is probably due to you not being that vested in the last R. That attitude got you into trouble. Do you want to continue with that behaviour?
5. Think of your BS as a prize. Please don't say that he already is, as you have shown that you do not really think that, or you would not be in this predicament. He already gave you an incredible gift of R the first time around. Make yourself worthy so that he can consider giving you that gift again.
6. Give up thoughts and behaviours of me/myself/I for the time being. Your selfishness has caused you to be in the same position twice
Only start that behaviour when your M is truly on a path of R, or if you need to protect yourself when you are single again, and once your daughter reaches 18.
7. Get out of the mentality that you are a victim.
My BS dragged me to marriage counselling, forced me to post here and by March 2012 I was eventually at a point where I gave up the affair.
This may be a bit pedantic, but this sentence makes you sound so eager *being sarcastic here* to stay in the M.