Yup he does have a bit of an ego on him right now... when you have two women chasing you that happens... he's full of himself right now...
I don't konw about the negotiating approach or about asking him for things, but... if you think that's the best way to play it go for it... I do understand he has some leverage here if he wants to use it... You seem to be fending him off better.
Just keep lots of people around you and he won't approach you about divorce.. he wont' do it unless you are alone... he's bullyign you... and bullies won't push you around when you have others present to protect you... every time you are alone he exploits it... so dont be alone with him... EVER