I guess I somehow skipped over the part where you kind of let H have it. I wonder what his response has been to that--no response?

It may turn out to be a very minor setback.

What would you say works the best with him? Do you think he's just wallowing in the attention of two women, playing one against the other? He certainly doesn't act serious about divorce. Does he respond better to your flirting or to your coolness? Does he like it when you speak your mind frankly, or when you act sweet and give him lots of affirmation? What works for you? I know it's hard to organize your thoughts when you're going through something like this, but there may be some kind of pattern to his behavior, and you can keep doing what works.