When real-life-ex-girlfriends are mentioned they're always acting like bitches? Why?

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FanfictionSo... this is a book where I wrote down some things about fanfictions. Pleaseeeeee don't feel offended about anything I wrote down, at least half of it I've done as well. This is meant as a joke.
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When real-life-ex-girlfriends are mentioned they're always acting like bitches? Why?