If it helps and you are able to see it...the guilt is unfounded. You have done nothing warrant any guilty. I'm playing armchair psychologist here but bear w/ me and think about it carefully. Why do you feel guilty? Might it be something you are conditioned to feel? Do not feel guilty because you couldn't "save" this man. He does not want to be saved. He has no intentions of being saved. You play a role for him. He is angry that he is losing an important member of the cast. He is not hurt because he is losing you.
Your fear may simply be fear of the unknown. The unknown being your reluctance to continue to be used to fulfill his unhealthy needs.
The unknown being your attempt to break your own toxic need to play the role you were playing and in doing what is in your best interests in order to become healthy emotionally.
You saw a tiny flicker of hope? Keep looking. There is a bright, powerful ray of hope that you missed. Open your eyes to it. It's there. Your life is yours. Stand by your decision. It was a good one. It is the only one that leads to health and peace of mind. The process of change won't be easy and it won't be quick. Be patient.
I wish you the best.

edit: I wish my mind were clearer. I'm so sorry. I could written that so much better I hope it's coherent enough to be helpful in getting you through this.