My advice, fwiw (which is presumably nothing - look where i still am!) is to do what is best for you and the kids. Don't think twice about what his recent behaviour might mean...or if he is making steps to reconnecting. My experience is that NOTHING we do or say can make them more likely to be ready to reconcile. They are going through this process and will come out (if they ever do) on their own time scale.
Leaving them WAY ALONE seems to be the best option; not initiating discussion of anything and being civil when they want to talk/interact.
If they want to reconnect, we will know. It will be clear. If they don't, no amount of second-guessing how to 'be' around them will influence them.
Also, I wouldn't engage in lengthy explanations of your decisions either. I've said similar things to my XH from time to time only to have them all thrown back in my face - e.g. "you ARE threatening me", "you don't realise anything", "I am not 'on a journey'", "I AM totally committed to my children", etc, etc. It all gets turned into grist for his anger mill.
But, on the bright side... your h may not be like mine in this. Just offering up the benefit (!) of my experiences in this regard.
