I agree! The translator keeps talking about red flags and I'm over here trying desperately to remember to explain the meaning of /nuance/ when I'm done the chapter. It's been so long though that I can't remember if we already knew why they are acting like this or not. Regardless though, this is a world of magic, for all we know they're both being held captive and other people are pretending to be them even with some kind of glamour. We have no idea why they turned a complete 360⁰.
In a non magical world, there's very nearly absolutely zero excuse for hitting the person you love, but this world has

Readers, remember that a story is more than what happens in one chapter? No patience whatsoever ( ̄へ ̄)If they are mean in chapter X, it doesn't mean they are bastards, like, let the characters have some nuances...
Let's wait for the reason of their actions, as i suspect it was a ploy to trick their familier OR they are under a spell or something.
Like, please...