From my conversations with others (and my own experiences), psychopaths tend not to be loyal people. Nearly all interpersonal matters are selfish in nature for us. What have you done for me now? What are you doing for me soon? We are amnesiac, and the benefits of the past mean little if an acquaintanceship is not producing in the present.
Our cold indifference as we strike those diseased in the now from our lives strikes many as callous and it should. There is no empathic bond as we determine that the “best” of friends from the past are liabilities in the present. It matters not that another may have helped us through great struggle or have been there through great triumph. If a person is not producing – or worse, damaging – in the present, they are often shown the door by the psychopath. It’s not personal usually, it’s merely a consequence of the self-centered choosing the soil that is best for growth in the moment.