In the literary work titled Euphoria, the person that Maddie lie about sleeping with in the pool is Nate.
It should be noted that the literary work titled "Euphoria is about a group of high school students as they went through friendship and love in a world of trauma, drugs, and social media.
In the movie, Maddie is a pageant girl and loves attention. She lied about sleeping with Nate in the pool.
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