"On the other hand, naturally expressive individuals are required to learn to deal objectively with their emotions and to stop victimizing themselves with stories of how they’ve been hurt. "
This passage depends upon a tacit assumption, namely that people who are naturally expressive of their emotions victimize themselves with stories of how they've been hurt. No justification for this assumption is presented in the paragraph. Therefore it is impossible (at least for me) to guess what the author means. I find his tacit assumption unlikely to be universally, or even usually, true.
What is this book you are reading? It seem to contain a lot of muddy writing.
Student or Learner