I'm so sorry I missed your last post too. Well done you for having the conversation with H- it must have been hard to do, bu it sounds like you got some answers and made some decisions as a result of it.
I have to say that I'm inclined to agree with Sunshine in thinking that at the moment things are easy for H- he gets to see D3 (yes, she is an absolute stunner!), and you when he wants to, and you end up living in limbo wondering what will trigger a change in the situation.
It's totally unacceptable for him to continue to see the OW, whatever their R is now, if he's working on the M. Him seeing her makes things uncomfortable for you and I don't know how you manage to deal with it. I'd be furious too if I was in your position.
So I'm going to ask the same question as K. Are you feeling detached enough to be able to show H what life would be like without you and D3 in it? It's so sad to have to think of that, and I feel so sad for him that he doesn't respect and appreciate the two treasures he has that he should be cherishing (that's you and D3 for clarity!).