I have a similar story but it involves a parent. I have had more gaslighting and bullshit from people for talking about it than anyone should have to endure. There is a taboo around shunning a family member that many people can't get over. Sometimes ending a relationship is the best thing rather than beating one's head against the same wall again and again.
My dad never came around and died not understanding what happened despite talking to him about it countless times. That part is sad however cutting off communication with my NPD mother (narcissistic personality disorder) has been one of the initially most difficult things I've done in my life. It took me 50 years to do it and my life is now better in every way. I don't even think abojt it any more because the cause has been removed from my life permanently.
TMI but worth sharing
:prepares to get shit upon: