Coming to this a bit late and I haven't posted on GN for a long time but I found this all very useful. I have also had problems in my marriage which have originated with my in laws and the family culture they lived with in which nothing was ever discussed and no one was close.
My MIL was an embittered, difficult woman who ejected her daughter from the family and spoilt her golden boy son. It took me years to see what was going on and to understand his behaviour. No one ever confronted anyone else so why would he not grow up avoidant and stone walling.
For me it's got worse as time has gone on because after numerous occasions on which he has failed to support me, only now do I understand and I resent and can't forgive any of them. When his sister, rather naughtily to my mind, told me what her mother said about me (not kind or polite), my breath was taken away.
We went for couples counselling and the counsellor immediately identified the situation. I was amazed. Financially I don't want to separate but how I feel such a lot of the time, I don't think is good for me. He, of course, avoids and I find it difficult that although he has come to see what his family situation has created in how he responds, it's still his default position. Seeing so many difficult relationships, I am part impressed at how strong some people are and a bit depressed at my own inability to move on. I have spent quite a bit of time this year Googling 'accepting the unacceptable'!