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The Mary Sue
The Mary Sue
Sanchari Ghosh

‘Girl tell his parents’: Woman says her boyfriend of over a year cheated on her, but you’ll never guess whom he cheated on her with

Katelyn TikTok

User @kateysuperspam dropped the craziest lore on TikTok last year, and people haven’t yet been able to recover from it. On October 17, 2025, Katelyn shared a video to her TikTok account recounting her experiences of getting cheated on by an ex-boyfriend. The same gained immense traction on the platform and, as of this writing has a viewcount of over 14 million and thousands of comments, saves, and shares. 

So what exactly does Katelyn say in this video? As mentioned previously, she speaks about getting cheated on by an ex-boyfriend. But the revelation of whom he cheated on her with will definitely shock everyone. Wait for it. It was his sister!!!! He cheated on her with his own sister, who was almost his age!!! 

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