Forgiveness is for your benefit, not the benefit of the other person.
There is a fine line between forgiving and forgetting.
Forgiving is to better yourself by letting go of the anger associated with betrayal. Forgetting is letting the other person off the hook for their bad behavior.
To answer your question, the way I grant forgiveness is I try to remind myself that when I don't forgive, I'm giving betrayers more power over my life, and that can't happen.
There is a fine line between forgiving and forgetting.
Forgiving is to better yourself by letting go of the anger associated with betrayal. Forgetting is letting the other person off the hook for their bad behavior.
To answer your question, the way I grant forgiveness is I try to remind myself that when I don't forgive, I'm giving betrayers more power over my life, and that can't happen.