I am reading that he is not willing to accept that in order to go forward you have to look back. I don't see how that can be a reason able expectation. If nothing else, you would want to recognize the mistakes you made together, so that you can avoid going down the same road again. And, he wants to put all of the responsibility for things not moving forward again on you. Because you are angry that things are not moving forward! Not realizing, or wanting to see, that if things were moving forward, you would probably be less angry!
I don't know what you should do. He doesn't want responsibility, yet he needs to take it on. Of course, none of us are perfect, but he is the one that left. If you talk to him, I think that you might try to clearly state why you have to look back. Tell him he doesn't have to answer the questions right now, but that you would like him to understand why you need to have answers. And tell him that your anger is more about what isn't happening now, rather that what happened in the past.
