Jennette McCurdy explains why she was 'jealous' of Ariana Grande

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"So now, every time she misses work, it feels like a personal attack."

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ennette McCurdy is opening up about her working relationship with her "Sam & Cat" co-star Ariana Grande

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According to Entertainment Tonight, in her bombshell new memoir, "I'm Glad My Mom Died,"

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the ex-actress detailed why she was "jealous" of her co-star during their time on the one-season

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Nickelodeon sitcom, and revealed the moment when she reached her breaking point.

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McCurdy famously starred as Sam Puckett in "iCarly," while Grande appeared as Cat Valentine in "Victorious,"

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and the two reprised their roles in the spinoff "Sam & Cat," which ran from 2013 to 2014.

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Jennette, now 30, shared the several reasons why she had feelings of jealously towards

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Ariana, now 29, including how the latter was allegedly permitted to "regularly" miss filming

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"Sam & Cat" in order to fulfill obligations in her music career, such as

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to "sing at award shows, record new songs, and do press for her upcoming album."

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