ABS-CBN published a report on April 20, detailing the psychology report behind Duterte's annulment with his former wife, Elizabeth Zimmerman.
In the news article, they quote:
In the article, it said that Duterte was confirmed to have "Antisocial Narcissistic Personality Disorder."
Even further, the article mentioned the traits that Duterte is most likely to have because of the said personality disorder.
photo from news.abs-cbn.com