Except even before this went over the top, I was already sympathizing with Stella. Even early on, Stolas had done so much narcissistic bullshit that I thought Stella had totally comprehensible reasons for hating his guts. That's before Vivz even just retconned it so she always just hated him literally for no reason, even though he was in the same awful forced marriage situation.
I think it would have been a more complex and intelligent plot design to have them have a falling out not because they were in a loveless royal marriage, but because Stella preferred propriety and keeping up appearances and Stolas was a flamboyant imp-fucker and was embarrassing her.
In my initial view, her problem wasn't that he was fucking other people, even peasants like imps, but that he was making a mockery of her and her social position instead of keeping it on the down-low, you know, like actual royalty did back in the day.
That would require a little complexity, though, and there's nothing like a little complexity to get in the way of a fujoshit schlicking to her delectable gayboys.