This episode focuses on the internal experience of borderline personality dynamics, what it feels like.  Next, I share how “borderline” is a relatively new diagnosis, and previously indicated a range of personality development, rather than a specific disorder. I then discuss the standard diagnostic criteria from the DSM-5 and the Psychodynamic Diagnostic Manual, 2nd Ed., summarizing the symptoms in plain English. I explore the etiology or the origin of “borderline personality” and the underlying unmet attachment needs that fuel borderline dynamics. I describe different subtypes of borderline presentations and explore the types of partners to whom those with borderline dynamics are romantically attracted. From there, I describe five major treatment approaches and briefly discuss an outcome study. In closing, I review some suggestions for living with someone who presents with borderline characteristics.