Listen to what he has to say and continue to validate...but when he brings up stuff that has happened, just say "I'm sorry you feel that way" and let it go. He's stuck on things that have happened and he'll continue to raise those issues because of the way he feels right now. He's still trying to convince himself that what he's doing is the right course of action. He's also testing and will continue testing you to see if you revert back to the old BW05.
I wouldn't pretzel myself for him. What happened in the past, you've apologized for and right now, in the present, you are trying to be a better person and be more open. You can't change the past and it's history. He's stuck in history and he'll be there for quite some time and rewriting that history. Don't help him by providing him the paper and pen to do so.
I would only share the day to day things w/him and I would limit how much I would tell him about your emotional state right now. If he's sharing w/others, then limit your sharing w/him.
Continue to work on you and do not allow him to tear you down, make you second guess yourself. Stay the course.
Sit quietly, the answers will reveal themselves when you least expect them to. The past is gone, the present is a gift and you need to focus on today, allow the future to reveal itself when it is ready.