The phrase "Who TF Did I Marry?" refers to a viral series of 50 TikTok videos posted in February 2024 by Tareasa Johnson (Reesa Teesa). In this series, she details her experience marrying a man she calls "Legion," who turned out to be a pathological liar. He falsified many details about his life, including his job, education, and personal history. They met in early 2020, married in January 2021, and after the marriage, she discovered his fabrications which included fake jobs, fake phone calls, false claims about family tragedies, and a criminal record. The story quickly gained widespread attention and is set to be adapted into a television series.

So, if the question is about who "you" married in this context, it refers to the man known as "Legion" whose real identity entailed numerous lies and deception as detailed by Reesa Teesa in her viral TikTok series.