Hi JoJo,
"Any ideas?" Here comes a bunch.....ideas not answers.
I am running off to yoga so I have no time to check for errors here, please excuse any mess as I have to go take care of ME!
Congradulations on getting out. You did the right thing for your children. Your compassion towards your X, their father, is excellent. I hope that you treat yourself with compassion too and in so doing also teach your children about alternative relationships.
I am impressed by how susinctly you articulate a very complicated dynamic. Also, I don't hear much about you in it. What do you need outside of averting crises with him (good move!) and what would/does attract you (even slightly) to a person who provides....provides what for you emotionally? Sounds like you miss something just a little bit? What is the "connection" you still feel? As you'll see in my long post here I too know a lot about my N husband. Problem is it is far more than he knows or cares to know about himself.
I’m not sure if I am looking too hard for an explanation that seems to
” join the dots” and I am just rationalizing very bad behavior.
I struggle with this issue too. My latest feeling is that looking for an explanation that seems to "join the dots" is, though time consuming and exhausting and complex for sure. What isn't so good is using that glorious effort to rationalize bad behavior. I struggle with it daily as I still live with my husband who has N traits. What is the motive to rationalize? That is a key quesiton for me. My desire to make Ok or more OK what isn't OK is exactly the key to why I am still here.
he has the intellect and education to behave differently – but chooses not to
I believe that it has nothing/little to do with intellect nor education and so much to do with connection and heart. He is making the same error in thinking it is about anything other than connection and feelings. I believe the brain is a servant of the heart. It can influence the heart and yet it is our hearts that make the final choice. He makes choices from a limited menu. We all do. I believe we can help one another expand our menus AND we can't always help those we want to help. They have to find their own menu expander and all we can do is encourage them to do so and take care of doing so for ourselves.
There is an interesting radio program in which a therapist speaks about Nism (Search this site for radio in subject and you'll find it - NPR) . There are a few guests on the program however I found the last speaker to have the most comprehensive perspective & experience. He describes when it is that Ns come in for treatment and actually work on their issues.
There is an article I posted (Steath Radar, ...) this month that is a bit laborious but describes briefly the passive/depressive N. It also reviews various apparent types of apologies and expressions of gratitude that are just attempts to return to a prior state, manipulate an outcome, fix a self image, vs true feeling of remorse, empathy and a desire to right the prior wrong as much as possible. My husband will likely want me back
WITHOUT wanting to even try to really make amends for what damage his behavior caused or to aim for a better relationship. He cannot see the damage, will not look at it as he has no tools to deal with pain and he has a prettier picture to look at instead. It is sad really as I believe that underneath his is a despirate struggle for survival. I also believe that to gain a truer self will require a sort of figurative death of his false self. No wonder they run.
My understanding is that N's (anyone else for that matter) have to hit rock bottom and not just regret the loss of attention and/or situation but
really feel pain. It isn't just that parents neglected them emotionally as children it is also about the parents having supported a false image, a performance for which the N was paid well, at least well enough. "Be a grown up, take care of the family, hide your limits, your needs and you'll get a cookie!" Of course the pay off is much more than a cookie and yet it is amazing what we humans will do for connection of anysort. Children especially and the inner child we keep inside will do a lot for a crumb, a piece of a connection cookie. The underlying message the parents gave is also that "pain is too hard to deal with. Hide it and perform instead" That is a great short term strategy NOT a way of life unless you are truely imprisoned and the world around you stays as constant as a prison. Even then I don't know how good of a strategy it is. If they don't feel and respond to their own pain how the heck will they learn to respond to anyone elses? In fact it angers them that someone would cause them disorientation (abruptly change the rules) by having feelings at all! It throws off their compass.
Sometimes I project my feelings onto my husband (with N traits who I am planning on leaving). I would and do feel intolerable pain that would/does prompt me to action (slow perhaps but ultimately action). I am motivated by joy too. So, I expect that is what is going on for him too. However, I am finally getting that the attention he recieves and the image he has of himself (that serves as a promise of attention even when he isn't getting it at the moment) is a sort of warm blanket to him, a buffer - anyway it is nearly all he knows intimately. I too share qualities with his lack of emotion - despite our relative difference in that area. How else could I have gotten here?
Now though my strategy is that I try to only respond to sincere experiences of emotion from him. I try not to respond to his anger as that is the only emotion he expresses and was the trump card in his family. Oh, yeah and it sucks for me!

They dumped too much responsibility on him without enough acknowledgement and support and then they praised him for his image and moreover when he got angry they gave him space. He didn't learn to ask for space or negotiate. He didn't learn that his need for space was in part a signal he needed support. He just got mean, like a caged animal backed into a corner, and it worked. His parents aren't to blame as they did their best. None of this is about blame. Unfortunately he uses the anger trump card with me and it doesn't work - it just triggers my feeling like a caged animal too. Otherwise though he doesn't express much feeling at all though. He won't say what is beneath the anger. And I am moving on so I am careful not to invest in trying to encourage his dealing with his feelings when he just isn't motivated to do so. Moreover, his mom interviewed him a lot..lived vicariously through him so my attempts to support his expressing true feelings triggers a series of defenses. Each person is so unique, so complicated. If baking a cake is difficult how can we expect tracing the recipie of a individual to be so simple! He gets just enough from his work and his family to keep on his N path. He did go to therapy with a male therapist who was compassionate and who diagnosed his Nism. That combination worked well however we moved from that city and my husband has not found not tried hard to find another therapist. Sounds to me like your X is also getting enough attention/feedback, reinforcement of his self image to keep on his path. Sometimes I feel that my love, as close to love as I can give a person who doesn't really show up, is just another buffer between him and the pain he must access to get authentic.
Either way I want to be in a relationship in which we acknowledge our vulnerabilities and strengths without shame or fear and we influence one another in support of empowerment that is bilaterally negotiated instead of unilaterally manipulated and bullied. I barely understand what that must feel like. Again it is about relative differences not right or wrong. Slight relative differences can have dramatic consequences though. My husband doesn't have the slightest clue and isn't even motivated to, doesn't yearn for a better relationship enough to search for it within our relationship (or otherwise) so [
i]I'm outta here![/i] (I got deep into it/him as you can tell probably from this elaborate post).
YIKES THIS IS THE LONGEST POST EVER....