Everybody and their grandmother are writing books these days. "Glee" actress and former fiancee to Big Sean, Naya Rivera, is among them. Rivera's book, "Sorry Not Sorry," is a memoir that covers her "Glee" days, her relationships, her struggle with anorexia and a lot more.

Among the book's revelations, US Weekly has obtained an excerpt in which Naya alleges that Big Sean was cheating on her with the singer who would become his next boo, Ariana Grande (currently boo to Mac Miller). 

Rivera takes readers back to the moment she uncovered his alleged deceit. "We'd been fighting for five straight days while he was traveling, and then on the one day that he was back in L.A., he said he didn't want to see me," she writes."‘Well, a‑‑hole, I've got a key to your house...I walk in, go downstairs, and guess what little girl is sitting cross-legged on the couch listening to music? … It rhymes with ‘Smariana Schmande.’"

As for the couple's brief engagement, Rivera says she found out it was over through the internet. "I learned that I was no longer getting married from the internet, and at the same time as the rest of the world," she writes, "Not only were we no longer getting married, but apparently we weren’t even together anymore."