What I can tell you is this: if you and the narcissist/abuser are no longer interacting and he is not presently causing you harm, you are now on a healing path.
What that means is that you are no longer being directly harmed by that person. You are being harmed by the stories you keep remembering and re-telling that are causing you fresh hurt every time you speak and think about them. You are hurting yourself.
Forgiveness, as far as I can tell, is not about saying “What he did to me is OK,”
Forgiveness, from what I understand, is not you saying “I want this person back in my life,”
It’s not saying “I feel free to trust this man again,”
All forgiveness is, at its basic level, I think , is that you are going to stop hurting yourself by telling yourself (and others) these stories about the terrible things that were done to you. Forgiveness is you deciding to be a healthier, happier person, to choose better people to allow in your life, and let that painful story go.
And, yes, as others have noted, there will need to be some acknowledgement that you made choices which allowed this person to stay and hurt you, so part of forgiveness—maybe the most important part of forgiveness—is to forgive yourself for allowing the harm for as long as you did. Learn from your experience and allow it to protect you in the future. You have learned something. You have valuable tools and skills to bring to new relationships, you have a better idea of who you are, what you need, and what behavior you will not allow. That’s hard-won gold of wisdom. Cherish yourself, as a survivor with wisdom. The past is gone and there’s no need to let it hurt you anymore.
editing to add: Forgiveness is something you do. No other person is required. It would be really lovely if someone who hurt you would feel remorse, make amends, and say that they are sorry for their actions in a way that you can trust and believe. But narcissists do not apologize (at least not with any sincerity—an apology from a narcissist is just more manipulation). And expecting, asking for, or demanding an apology before you forgive is a waste of your time and energy. You cannot control the other people in your life, you cannot force a sociopath to feel empathy or compassion or remorse. Forgiveness is part of your own healing. It is within your control to give or not, as you see fit. No one can force you to forgive before you are ready, just as you cannot force someone into a genuine apology.
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