Wow, what a difference a week makes. You have been doing great with being able to pulling away from him and leaving the path back home open. Your poise has shown through so well especially with a crazy woman in the picture.
Working on the problems that ultimately caused his affair will come. Some will be easy, others are buried... I suspect those buried issues are going to take some real time to uncover and gain perspective / fix. Take it slow, protect yourself and be confident that you will come out of this better off, with or without your husband...I don't think we are ever really done working on ourselves. For the record, complacency was one of the big issues in my marriage. I spent so much effort putting a plan for our future in place then kinda hit cruise control and ultimately stopped paying attention. Pretty sad in retrospect.