Pat has a personality disorder characterized by emotional instability, extreme insecurity, self-mutilation, and intense fear of abandonment. pat would most likely be diagnosed with

The fact that Pat has a personality disorder characterized by emotional instability, extreme insecurity, self-mutilation, and intense fear of abandonment. means that he will most likely be diagnosed with borderline personality disorder (BPD), which is  a mental disorder, a condition characterized by disturbed and unstable interpersonal relationships and self-image.