Well, not to me. It would make sense if you had been treating her without respect, or told her you didn't want a serious relationship, or been cheating on her back.
But if you chose to be with her, if she's been faithful to you all along, or if you have started a triple consensual relationship with her and Jess, it doesn't make any sense that she would abandon you just because she has... what? Become a depraved fiend or something due to her high horny points? You can be horny, even kinky, and explore sex with your partner without having to dump them no matter what.