Who is The Man Whose Friends Abandon Him from Einstein's Dreams and what is their importance?

In the May 3rd dream, a man's friends abandon him for seemingly no reason. Later, he begins acting obnoxious and horrid, making a fool out of himself and alienating others. Which is cause and effect? Does the friends' abandonment cause him to become insulting, or does his future insulting behavior retroactively lead to his friends abandoning him? This story highlights how cycles can become self-perpetuating.