Forgiveness is a process, not a destination. Its nothing you have to communicate out loud to anyone or even here on the forum. You just decide to start doing it and do it.
Neither of my parents forgave each other following their D. They are old and bitter now. Because of that, my siblings have recently decided that even our sibling relationship, which was a strong bond for decades, is now no longer worth keeping. Its breaking my heart but I get it.
Not saying that will happen for you. Every situation is unique. It is only one potential real world outcome. It is what it is and life goes on.
I'm sorry you had to go through everything you did. It sounds horrible. I can't imagine how difficult it must have been. Processing it will take time.
