Rome wasn't built in a day, therefore, your emotional stability will take a while as well. You are on the rollercoaster ride from hell. One minute you will be up, the next down. Two months isn't a very long time to even begin thinking that you can detach completely. You have children and your h (whether he is in a sane mode or not) will most likely want to see them periodically.
Your focus has to be on you, your children and your finances right now. We all have been right where you are and I can say it takes a while to get the hang of not reacting to his every word, motion or behavior. It's not you, it's him.
With Christmas right around the corner, please try to focus on your children. They are going to need you in the days to come because you are the only adult/parent in their lives for now.
Keep your expectations at zero w/your h. As for you, don't be so hard on yourself and expect to be fully detached this soon....take it one hour at a time.
Please try to enjoy your holiday w/your family and friends. God will watch over your man/child.
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.