Agree 100%.
I finally played an update.
Well, I think this whole thing were executed poorly, I would even call a lazy writing.
That's why I am not a fan when Developers try to put every possible fetish in a game without properly integrating it. I mean, basically, if MC says OK - Cathy who was fully straight, never ever showed any interest in other women - becomes lesbian/bi, just like that - in 1 click, yep. Nice character development.
Also I would say, that this scene is kinda a spit in a face for fully monogamous/romance players, one thing if you play as a man-whore - I think it would be a bit hypocritical to be mad about this scene, but players who played full Cathy-dedicated path without fucking around sure didn't expect to be gaslighted like this, well, except for players who like lesbian content, they are probably fine.
And last thing, I thing this scene also just showed what a shitty friend Chloe is, I mean, hear me out - she IS a genius, literally, very smart, and even on man-whore path MC is not very subtle about their relationship (with Cathy i mean), neither is Cathy, and yet, knowing that, Chloe still makes a move on Cathy.... oh ,well. You might say - hey, they were drunk... - yeah yeah, they were - and that's why I called it a lazy writing.
I am sorry If am being harsh, It's just that - I played the game only because of Cathy and only on fully Cathy-solo route and for once I hoped that the game will spare me this BS, oh well, it was very foolish of me hahah.