Often those with Borderline Personality Disorder (BPD) work to keep sets of friends from meeting or knowing one another due to the fear that by talking with each other they will find out that the BPD not only isn’t who they say they are, but is a “bad” person. Friendships often don’t last for extremely long times and usually combust in anger.
BPDs start their romantic relationships by trying to be everything they think their partner wants in a life partner. They adopt the interests and views of those around them, sometimes even appearing to be more passionate about those interests than the people they are copying themselves. Unfortunately, trying to keep up this false personna is an effort and over time, BPDs lash out in rage as their self control slips.
Diagnostic Criteria for BPD from the DSM IV:
BPD is a pervasive pattern of instability in interpersonal relationships, self-image, and emotion, as well as marked impulsivity beginning by early adulthood and present in a variety of contexts, as indicated by five (or more) of the following:
1.)Frantic efforts to avoid real or imagined abandonment (e.g. if you start to leave the relationship, they either become ‘perfect’ or they lash out in anger.)
2.) A pattern of unstable and intense interpersonal relationships characterized by extremes between idealization and devaluation (i.e. “I love you, you’re wonderful” vs “I hate you, you’re a terrible person, no one else would put up with you”)
3.) Identity disturbance: Markedly or persistently unstable self-image or sense of self (e.g. change appearance often, change careers often, gain and dismiss friendships frequently.)
4.) Impulsive behavior in at least two areas that are potentially self-damaging (e.g., spending, sex, substance abuse, reckless driving, binge eating)
5.) Recurrent suicidal behavior, gestures, or threats, or self-harming behavior (e.g. cutting, bulimia, anorexia, etc.)
6.) Emotional instability in reaction to day-to-day events (e.g., intense episodic sadness, irritability, or anxiety usually lasting a few hours and only rarely more than a few days)
7.) Chronic feelings of emptiness (bored, have no purpose, no worth, social detachment, etc.)
8.) Inappropriate, intense anger or difficulty controlling anger (e.g., frequent displays of temper, constant anger, recurrent physical fights)
9.) Transient, stress-related paranoid ideation or severe dissociative symptoms (e.g. feeling like their spouse is having an affair, no one cares about them, etc. They may feel unfairly misunderstood or mistreated.)
Another resource article is at bpdcentral_com/images/Ihateyou.pdf