Honestly I think you need to stop talking to H about ANYTHING other than your kids.
I think if you can really do that, you will start to feel stronger and more confident.
Your H wants to keep you close so if things with OW don't work out, he has you.
Don't give him that luxury. Tell him you will ONLY talk about the kids, everything else is off limits. No talking, no touching, no flirting... nothing.
He needs to feel a sense of loss. And so far he hasn't. He still has you right where he wants you. Take control of you, Red.
You have more power than you think. Establish your boundaries and MAKE him respect you.