I have to agree that it's all rather confusing! These sitches always are.
It DOES sound to me like your XH (when did you divorce?) wants you around, his behaviours say as much.
And you say the OM was a mistake and you want out of that regardless, right? Then I think that is your first move...hard as it is!!! You will have to go out on a limb and sever that R if there is any home for your R with your H.
Heck you'd do it ANYWAY right, as it was not the right move for you? I guess it would just seem much better from your H's POV if you left this guy without really knowing what your chances are with him.
This way he knows he's not just a "fall back", or something like that.
I know you're wanting to know what all this contact MEANS for your H...I wish I could tell you! I can say that I've rarely heard of x-spouses making such an effort to have time with their x, if there was NO interest there.
That's something, over time, you will have to clarify with him. Heck, HE may not even be sure right now! How can he be?
So, keep posting, keep listening to your heart...You've read DR? How about the five Love Languages? After the Affair??? All GREAT sources.