[Summary] In "I Hate You—Don’t Leave Me: Understanding the Borderline Personality,” Jerold J. Kreisman and Hal Straus examine Borderline Personality Disorder (BPD), a mental illness characterized by unstable relationships, intense emotions, impulsive behaviors, and a distorted sense of self. The book explores the development of BPD, highlighting its roots in childhood trauma and unstable family dynamics. The authors also explore the impact of societal changes, including the rise of individualism, cultural fragmentation, and shifting gender roles, on the prevalence of BPD. The text examines the complexities of treating BPD, discussing various therapeutic approaches including psychotherapy, medication, and hospitalization. Finally, it delves into the neurobiological underpinnings of BPD, exploring the role of genetic factors, neurotransmitter imbalances, and brain abnormalities.