My mother, 90 now!, asked me to be friends with my brother. We don't get along, and I'm convinced we won't ever get along. I admit, at this point, a large part of our not getting on is that I won't forgive his many transgressions. He'd no more ask for forgiveness that I am willing to grant it. Forgiveness on this scale is more than either of us can manage.
I don't sweat it. Should anything happen to my mother, I shall wash my hands of my brother (my father passed some years ago). I realize that the issues between us are foundational. We're very very different people, with different values, and different goals. I have no need or desire to talk to him again.
So sometimes, I see no value in forgiveness. There is a line, and once crossed there truly is no going back. Life isn't Hollywood, so tearful reunions aren't to be expected. The only, minuscule, chance would be if he came to me in full confession mode. But frankly, that isn't going to happen.