Whereas I'd argue it replaced one cliche with another. Instead of being the prom queen (a role she had started to grow beyond), Sage is a the loser fangirl. Yay.
But honestly, I don't think either of our interpretations is correct. DPC isn't trying to imply Sage is a subtle metaphor for abusive relationships nor a self-deluded romantic. He still thinks she's the ultimate party girl that all the guys want:
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Which is a problem because - as far as we have been shown - Sage hasn't had a guy *
ACCEPT* her advances in two years (and counting, if the MC snubs her, too)! That's why I say it undermines her character, because it's pretty clear we're not supposed to notice how utterly nonsensical her relationship with Chad is.