Like all billionaires, he is an empty void that can never be filled. To borrow a phrase, he is a hungry ghost.
After his first million he needed more, then after a billion he saw that it was not enough, then after becoming president... he is, was, and always will be an empty hole of a person who can never feel satiated and who can consequently never feel genuine happiness.
He is not just a bad person, his is a bad soul.