Finding meetings for yourself, Al-anon, Nar-anon, CoDA or any number of Family support meetings will help you find your balance and make decisions that are good for you and your children. Counseling wouldn't hurt either, you need support in place for YOU...regardless of how the outcome for him unfolds.
What's done is done, you know the truth, the future is unpredictable. It's good you have a job, maybe start making a plan for yourself in case he relapses. You may not need to use it, but having a plan makes it all more workable when the time comes.
I read a lot of pain in your post, I am so sorry you are going through this. I pray that you and your children can find a life of peace and love and safety and without abuse or the fear of it...with or without him around.
Good luck dear, I'm glad you found us.