Great job reflecting and understanding that it is all speculation. Also, there is a possibility that, to top it all off, he's still in resentment because of your original walking away on him.
Own your parts and your parts only and fix them, even if you never plan to get back with this guy. Sometimes we might think we've fixed them, simply by acknowledging them. Without practice, we don't know they are fixed or just stuffed. Your H is still a possible opportunity to see if you've fixed those things, again, even if neither of you want back.
You do sound great and I definitely see growth in you. Keep those positive changes going! Make them habits!
You point out some very interesting things that have come up for him and will come in the future. Note those. He will possibly react to them as they come closer and you could possibly be a target for either spew or false connection (if he looks to you for security).
Support him without enabling him. I think based on your posts regarding his positives and your own, the future looks good, no matter the outcome.
