I'm sorry you find yourself here. You've been through quite an ordeal. First of all, is your H in counseling? I know we all deal with the death of a parent in different ways, but his reaction seems extreme and it might be important for him to understand why and to make sure he is healing from his feelings and not just repressing them.
As far as giving you information about what happened, I believe he needs to be willing to answer any and all of your questions. Just know what you want to ask. We all want different levels of information, so what you want is up to you, but just remember that whatever information you get is with you forever.
Hopefully this is not an issue, but you need to make sure that there is NO contact between this woman and your H now.
As far as you having a hard time with it: yes it's definitely very normal. It seems the WS often wants to just move on and be done with it. They are ashamed and don't want to revisit it and they have all the information about what happened so they don't go through the wondering why and how, etc. For the BS to have a harder time dealing with it is very normal.
I wish you the best. Keep us posted.