“Psychopathy is a complex personality disorder that includes interpersonal and affective traits such as glibness, lack of empathy, guilt or remorse, shallow affect, and irresponsibility, and behavioral characteristics such as impulsivity, poor behavioral control, and promiscuity.” Here a paper of interest by Kent A. Kiehl, A cognitive neuroscience perspective on psychopath: Evidence for paralimbic system dysfunction Here
If you have been targeted/victimized by a psychopath there is one thing you should remember and that is, it is not your fault. In other words, do not blame yourself regardless of what happened. These individuals leave a trail of destruction behind themselves wherever they show up and you are most likely not the only one who have been targeted. In order to heal and protect yourself, mentally and physically, learn as much as you can about these disordered individuals.