Symptoms of Borderline Personality Disorder
Frantic efforts to avoid real or imagined abandonment
A pattern of unstable and intense interpersonal relationships characterized by alternating between extremes of idealization and devaluation
Identity disturbance: markedly and persistently unstable self-image or sense of self
Impulsivity in at least two areas that are potentially self-damaging (e.g., spending, sex, substance abuse, reckless driving, binge eating)
Recurrent suicidal behavior, gestures, or threats, or self-mutilating behavior
Affective instability due to a marked reactivity of mood (e.g., intense episodic dysphoria, irritability, or anxiety usually lasting a few hours and only rarely more than a few days)
Chronic feelings of emptiness
Inappropriate, intense anger or difficulty controlling anger (e.g., frequent displays of temper, constant anger, recurrent physical fights)
Transient, stress-related paranoid ideation or severe dissociative symptoms

I took this from http://psychcentral.com/disorders/sx10.htm