11 Shocking Facts We Learned From Amy Schumer's Memoir 'The Girl With the Lower Back Tattoo'

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Her mom left her dad for her best friend's father.

"The day I learned [my mom isn't perfect] also happened to be the day my childhood best friend, Mia, and I fell out forever. It wasn't a wacky coincidence. My mother was having an affair with Mia's father," she wrote.