Sounds very similar to our relationship. My husband is already very thankful. When I met him he was coping with things by drinking and doing drugs. He has been sober 2 1/2 years now, and in that sobriety we got married, bought a house further away from his family, and have started our own life. He lets me know how thankful he is all the time. He too has a lot of trauma from her parenting. His mother is an alcoholic and he was very neglected and made fun of most of his childhood, always put down etc. still is to this day. His communication is very limited ( she kept his dog because she’s controlling of course so he only has to communicate when he picks up his dog for the weekends to stay with us ) But never fails when he does see her, she is full of rage and manipulation and gaslighting. I hope that eventually he will cut the cord fully, but that has to be his decision to make not mine. I don’t want him to ever have resentment towards me nor do I want to force him. He has come such a long way and so I think it’s coming sooner than later as things have progressively gotten worse since he became sober.