hmmm...not say frustrated, but perhaps didn't really understand what u were looking for. If you are really trying to put a tag/label in order to find peace with yourself (ohh, so he is a xxxx in the DSM IV), then okay lor, u got what u wanted. He's got one of the personality disorders: either the borderline, the sociopath, schizoid/schizotypal or histronic personality disorder.
I don't think he is a borderline lar...doesn't fit DSM IV criteria, which I list below:
Borderline Personality Disorder
A pervasive pattern of instability of interpersonal relationships, self-image, and affects, and marked impulsivity beginning by early adulthood and present in a variety of contexts, as indicated by five (or more) of the following:
Frantic efforts to avoid real or imagined abandonment.
Apattern 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.
The real borderline will be totally affectionate with you one day, violent and abusive the next, and then will always be threatening suicide...so i dun think this guy is lar..though there are aspects of it present in your description. If he had been, your description of him would have been "I felt I was in hell"
You can go and check on the DSM requirements and etc online,say at psychnet,
http://www.psychnet-uk.com/dsm_iv/_misc/complete_tables.htm to satisfy your understanding of what he is(was)
happy reading!