I’m genuinely scared …

For context, I’ve known this girl since my senior year of high school. We’ve been on and off for years, but we’ve never dated or had sex. We just spoke and never got far because of her temperament. I’m a very chill guy, not much bothers me. But she would say and do manipulative things and I just don’t have patience for that. I’ve expressed myself in the past and every-time she would come back after I’ve stopped communicating, i would stupidly tell her she can’t do the things I didn’t appreciate in the past and accept her back. Now her saying I asked for another chance is crazy. But I’ll just leave it at this. She continues to message me to this day and I’m scared she might pop up on my job one day. I’m scared to block her. I just hope she gets the hint one day and moves on. She’s not ugly either. She’s very pretty. Just too much for me. (I wrote over her number and the times she said my name in text for privacy)