Having experienced this more than once, and with almost opposite ends of the MLC severity spectrum, I too thought my instinctual response of self protection and removing myself from my MLCer's reach, would make him think about what he was missing.
It probably did. His level of cray cray was less severe last time. He stayed with friends of ours not far from our home and within days was badgering me to be able to come home.
I remember him saying afterwards that there was 'something very wrong' with him because he 'didn't feel any empathy at all for either me or his EA' during that time.
A distinct contrast to his long term screwy thinking this time.
I have read many times where people think they have managed to control the crisis by their behaviours and forcibly trying to encourage others to do the same because they are convinced it too will 'work'. That's what I think is floored thinking. If you haven't witnessed this level of cray cray, then you're in for a shock if you ever do.
This time, what 'works' was being able to survive financially a highly explosive disorder or dis-ease (as RCR would say).
NOTHING this time seems to have made any long term impact on him.
He has been as determined to live his new life, as he has been to have me be a secret part of it.
He knew he had me between a rock and a hard place because of the finances. He told me on many occasions that he knew I let him near me because I was financially vulnerable due to our business and the boys. As RCR suggests, I was as kind, gracious and polite as I was able to be.
He was very open about all sorts of things to start with - his confusion, how the OW was enormously selfish, how their relationship was tumultuous, how he disliked her family immensely. I would listen with open mouthed horror to start with, until I did not want to hear any more about her. I started to walk out of the room if he mentioned her at all. It took him ages to get the message. He said he would have to bring the OW to our house for afternoon tea
He frequently apologised, realised he had had a break-down, would get help, then in the next few hours change tack and 'there's nothing wrong with me Kikki', 'we just make each other feel bad' would come out of his mouth again.
That all changed (his openness about the OW, and his ambivalence towards her) at around the 3.5 year mark post BD and he appeared determined to stick with his new life.
When I managed to get him to agree to a settlement (of which he was the distinct financial winner), he was very angry with me for quite a few months. We occasionally need to have contact due to a few lasting ties, and he finally seems to be polite again. I guess this may wax and wane.
An old friend of mine who had this happen to her 10 years ago, is convinced that he will already be deeply regretting what he did, but will feel too stuck in his new life, to do anything about it.
She asked me what I am going to do when he comes knocking on my door in a few years time. She hopes I don't take him back. I am not convinced he would ever do that now, even though I couldn't imagine him NOT doing it until recently.
So much trauma, and so much change has been forced on me and the boys, I can't imagine how any of us would ever integrate back together now.
I guess I don't trust that this wouldn't happen again, because of what I have experienced.