Autumn, I think we ALL backslide from time to time. It sounds like you have a good attitude about it. Don't beat yourself up, learn from it and do the right thing next time.
It amazing how convincing the WAS can be when they're doing their own self-convincing. It's almost believable at times.
At least your H still is willing to go to MC. I would take that as a positive, regardless of his motivation.
It's too bad your kids are are seeing as much as they are. They can be amazingly perceptive, too, and will try to take on things that aren't their responsibility.
I'm glad you have some fun GAL activities planned for this weekend. Enjoy - these are very important right now!