I admit this is all speculation on my part, but my gut tells me he has her so firmly wedged underneath his boot this was actually one of his better episodes.
I believe she's part of the whole grift and is maybe fine as long as some of the $$$ comes her way. Maybe she even prefers he gets his jollies elsewhere rather than it being her job.
From what I've seen, she's just as manipulative as he is, just in a different way. She's used people for "help" when she needed it, but it seemed like it was really for leverage to get a better deal (?), not to actually move on.
Regardless, it's her life and he choice. If she choses to stay that's all on her. It's not the 1800's anymore, it's pretty easy for a woman to get a divorce and she is at home in her own country so wouldn't be stuck in a foreign land which could be more of a challenge.
I have little sympathy for women who go back for more and believe the empty promises, they just seem lazy and afraid of the effort that actually moving on with your own life would take.