I think people do a massive amount of damage to their own healing by trying to forgive people out of some idea that they need to do so to or else they will never feel okay with themselves and are just going to get worse every day.
If this person does not consume your thoughts anymore and you couldn't give a shit about them anymore - that's called being healed. They don't hurt you anymore.
Trying to find a way to forgive a person who has wronged you, that you have already moved on from and left in the past, is like trying to make yourself better by cutting away scar tissue with a nail clipper. It just makes new wounds over the old one and fucks everything up all over again.
If you get to a place where you feel like you can forgive someone, then power to you. If you have moved on without providing that forgiveness, it's insanity to double back and revisit the world of hurt. Let it stay healed. Don't pick at it.