She wanted to divorce him because she thought he was a cheating good-for-nothing salaried doctor who didnt earn enough but still had the gall to want sex at least once a month. She should be freaking happy and thankful that after getting rid of him he is still willing to do her all the favors she asks for, but instead she behaves like a bitter old hag.
Guess she is butthurt because she got second thoughts after the last good dicking he gave her before divorcing, but he asked right away to continue with the divorce.
But this happens a lot actually. Even if you are the one to end a relationship, if the other person quickly rebuilds their life you can still get salty about it, because if they are so fast at doing so you feel like you actually werent that important to them to begin with.
Also people shouldnt only think about the situation from the MC's perspective. If you think about it from her point-of-view where she thinks he cheated on her, then she feels like the victim in this divorce situation. But even so she gotta lower herself to ask a favor out of him, live with a dude she hates, plus all the stress from her work and the sudden illness of her dad. All that while she sees how her ex easily continues his live as if she never wasnt there, then i understand why she can be so pissed.
No like he did anything wrong, but from her POV he did.