I havent read it, but to my understanding all these moments happen in thr book. They just arent ever confirmed to be together, their relationship is more up to the readers.
I might be remembering wrong, but this is what i understood
someone said they dont technically end up "together" together but there's no other special someone for both of them either. like at the end mehen is running the estate like he's the duchess ╮( ̄▽ ̄)╭
God they're so gay for eachother.