This year I cut off all ties with my sister and it was one of the best things I've ever done in my life. Reason are not quite the same as you but similarly it's a lot about how she fails to see things from my perspective and how self centered she is. Took me a long time to come to terms that it's okay to part with my sister, since society sees it as something really extreme. Might not be your case ofc but if you need to, know that it isn't that crazy of a thing to do.