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Pretty complicated word, but I think it will simply refer to upset of ordinary routine for many characters and people who seem certain way revealing it was just a facade. Some example of which characters could have the "paradigm shift":
Nick, obviously, with his love for Heather and possibly being involved in some shady stuff.
Josy trying to be good girlfriend to Maya, but having feelings for MC.
Ashley struggling to give Derek a chance or not while clearly having nice chemistry with Anthony.
Lily clearly harboring some deeply personal agendas while only exerting careless attitude, that will crash and burn sooner or later.
Chad and Troy coming out of the closet!?
Beth, is she a puppet or perpetrator of the smear campaign?
Will Jill's anti-bullying campaign develop and if so will MC be used as example of bullying or being bullied?
I'm sure there are many more examples of characters who have foundation for a shift in their story. I don't think it will be something as crazy as your affinity flip unless it's done in a way where MC goes through an event of "realizing he behaved irrationally thus far" and then have a CHOICE to flip affinity. That could work, but I still doubt it.