Finally cutting off a toxic best friend, but there

My current roommate and I used to be inseparable best friends for a couple years, and have been roommates for a long time (close to 5 years). I used to be very naive - I didn't know how to set boundaries, didn't have the confidence to stand up for myself, and was too forgiving. This person is incredibly controlling, bossy, non-empathetic, and borderline narcissistic and I have endured what some other people in my life have titled her behavior as emotional abuse. I have only within the last year or so realized how detrimental this relationship has been to my mental health, self-esteem, and other relationships. I will also note that one of the biggest fights we have ever had is not captured because I was so upset and distraught that I deleted the entire text conversation and can't find a way to recover it. Summarized, she became enraged when I told her I was going on a date with someone (who is now my SO of almost a year). She told me that I was depressed and lonely, and that I needed to get the idea of being in a relationship out of my head because it wasn't ever going to work out. I had spent two years prior to this being single and working a lot on myself and furthering my career after struggling with anxiety and some depression.