I found this account on Instagram and all their posts where sad short stories, and I found one post that reminded me of Marinette's crush on Adrien. (I'm sorry if this breaks your guys's hearts.(I'm crying rn, this is so sad))

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Sad Adrienette story

Marinette sat behind her crush Adrien in school everyday and admired his long-ish blond locks until one day it was all gone. His head was shaved. He felt her gaze on him, turned around and said one word "cancer."

He died in Marinette's arms after four years of marriage.