Responses
Maybe spoiler??....
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I think that was his original plan. Since Navier wouldn't "adopt" Trashta's baby, making it an imperial heir, He opted to divorce her instead, marry Trashta for like 2 years or so, solidifying the child as his heir, and then doing the whole "Well that never happened" trope and re-marry Navier because he KNOWS she's the better empress.

What's wrong with this incompetent cheating emperor. He divorced her, stripped her own title and he's still trying to be possessive and locking her up. He is retarded