Ex with suspected BPD/NPD blocked me after ghosting for 3 weeks. How should I handle this?

[u/Dense-Stress6360]

I was in an on-and-off long-distance relationship for 5 years. After a 2-year honeymoon phase, it became a toxic cycle of explosive fights, silent treatments, and me constantly chasing her to fix things. Eventually, she began self-harming and threatening suicide during arguments.

A year ago, she broke up with me and blocked me when I refused to just "be friends." After 2 months of me chasing her, I finally went no-contact, started healing, and began dating someone new. My ex found out, chased me back, and because I still loved her, I gave it another chance. We agreed that if she threatened suicide again, it was over.

Six months later, during a minor argument, she threatened suicide again. I broke up with her. In response, she "feigned her death" by ghosting me completely for 3 weeks, though I saw her active online. She then broke her silence with an angry, cruel message accusing me of moving on because she saw a photo of me with a female coworker. She blocked me again.

Two weeks later, she messaged me saying she acted that way because I "made her jealous," and asked: "What can I do to make you cool down?" shifting the accountability entirely onto me. I left her on read.

I strongly suspect she has Borderline Personality Disorder (BPD) or Narcissistic Personality Disorder (NPD). What should I do next?