There is no forgetting possible for the most part, if the pain was strong enough. Pain is a teacher that engages the memory, whether we want it to or not. Even forgiving, I am not so sure about, because people I have met might say they forgive, until the next time they are hurt by something and the dredge it up.
For me, I mostly just move on, making the person irrelevant in my future.
That is one's personal experience. If we want to be forgiven for our own wrongs, we must be open to apologising to those who wrong us. How can we demand something that we are not able to give.
I never expect to be forgiven, because I don't think forgiveness truly happens. It is just ignored until convenient to bring it up again.