I just cut them out of my life, simple no more contact. I would rather be alone then deal with toxic people. Easy for me to say...I'm married and have my husband's loving support. However when I was single and before I knew I had BPD I had many people who I had to cut out of my life as they were toxic to me. I had a therapist who recommended the book Toxic Parents to me, it helped me recognise and remove the toxic people from my life.

https://www.amazon.ca/Toxic-Parents-.../dp/0553381407