This can be applied to her Mizora reaction btw, especially when we know that she is, in fact, insecure.
I agree, that would technically be a valid way for her to respond. But past the first line, nothing in the dialogue and the tone of her voice show any of that, and Jennifer is an excellent voice actress so I am not going to assume she just messed up - it's clear to me that it wasn't written that way. The only thing she seemed disappointed about is that you didn't ask first. There's plenty of times you can hear genuine disappointment and sadness in her voice throughout the game to know that this isn't it. And I'm still vehemently against the idea that she supposedly expected you to cheat on her. She's not insecure enough to defy a goddess (her only support) for someone and devote herself fully to someone she thinks will cheat.
Though, judging by her reaction if you break up with her, I don't think she'd canonically respond that way anyway.
And like I said, the dialogue regarding how she was raised directly contradicts her entire Sharran story arc and how she acts throughout the game.
Edit: Also, for someone supposedly that insecure, she seems awfully keen on suggesting a session with a bunch of prostitutes. It's just inconsistencies within inconsistencies. All three of these optional scenarios are horribly written.
