People with borderline personality disorder constantly live on the edge: they fluctuate between love and hate, fear and anger, inner emptiness and euphoria. However, it is not only they who suffer from this inner chaos. Their rapid shifts between idealization and devaluation, their aggressive and often self-destructive behavior, are particularly burdensome for their interpersonal relationships. Udo Rauchfleisch helps relatives, friends, and partners of people with borderline disorder to understand this serious mental illness. The experienced psychotherapist provides many concrete suggestions on how to manage living together despite all the challenges. A unique guide specifically for the relatives of people with borderline.