I am so sorry you have to go through this. I am praying for ALL of you as I am typing this.
All of the emotions you are carrying anger, hurt, fear, sadness are all true and valid emotions at this time. I encourage you to give them to your pillow and your support group. Then you have to face the world without those emotions.
Yes continue to DB! Because DB'ing is really about YOU! Its preparing you for the way forward WITH or WITHOUT your spouse.
I'm sure you realize that you cannot stay the same! Whether its in a relationship with your H or in other relationships you have to create a new you.
learn Detachment. (try Mindfulness Meditation, Wherever you go there you are by Jon Kabat-Zinn)
GAL-in particular I recommend joining a yoga, work out or running group that meets regularly. The group aspect builds cameraderie, the physicality builds confidence and the endorphines are a natural anti-depressant.
Go to IC- Learn about who you are, to build the good, to minimize the not so good,Learn effective communication tools.
Take care of AM2012, don't worry so much about H. You are trying to build such an awesome AM2012 that your H gets swept along with your progress. Or maybe to be ready when another relationship comes along.
And yes your kids will never ever forget the conversation. Your goal now is to create an atmosphere that when your kids look back on it they say "that was a shitty time in my life, but my Mom AND Dad handled it so well that I grew as a person from it"