I thought I was doing really good, right up until she contacted me
Funny how that works, eh?
Actually, in all fairness, your response to your W's first text would have been really good if it was, "Ok. Thanks for letting me know."
Sure, NC would be no response at all. But you have kids and this was about the kids, so... Really, your best is dim... bordering on NC...
So yes, we're all about changing your patterns, right here, right now... for as long as it takes for you to get into the groove, as it were...
Anything that you THINK you might contact your W about, post here, first. We (me and other members, of course) can help you sort out what part you can figure out yourself, without needing to contact your W. And help you figure out what you MUST contact your W about...