In spite of feeling this rage against that person, it’s ok, you have reasons to feel that way but live this feeling. Let yourself feeling it bc you are stronger than this feeling and you are gonna be able to keep in until it diminishes.
Do you really believe this is the best way to help your ex? Consider other possibilities even when your feelings don’t let you see them just now. Only to take them into account.
If you were in her shoes? How would you feel more comfortable with?
Is that guy still in prison?
I know it’s very hard to see beyond your feelings and control your impulses just now.
Can you contact a therapist or are working with a therapist?
Did you learn any technique to manage and control these feelings?
You need to let them a time so they (feelings) are gonna show their real face. If I’m not wrong. I’m not a professional. Do you feel confident to talk with a psychologist just now? If not, at least, stay here with us.