The fact that he has not looked into divorce, nor even looked at requirements for moving to UAE for work with an unmarried partner, and talks vaguely about divorce to OW, sounds like he's been stringing the OW on.
After all, you do EVERYthing for him, and if she's as driven etc as he says, she's not likely to do the same for him.
He's a very transactional and money-oriented guy, I'm pretty sure he's done the labour and financial maths: he sees that it's best for him to keep you as the domestic labourer and childcare provider and the OW future faked for as long as possible. This way he doesn't take a financial hit AND he gets sex with another woman AND his shorts washed etc.
So it wouldn't surprise me if he tries to get back to the very very sweet spot he's in right now eg by protesting love for you, that he'll try harder, OW doesn't mean a thing to him etc.
So just prepare yourself for this mind-bending possibility, OP.