Elon Musk's Exes Describe Volatile Relationship Behavior in New Biography
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Elon Musk's ex-partners describe him as emotionally volatile and difficult to date in new biography
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His first wife said he called her names like "idiot" and "moron" during arguments
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Singer Grimes said Musk has "demon mode" where he tears into employees
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Musk postpones vacations for work and relationships involve "mutual meanness"
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Despite volatility, Musk can be tender with girlfriends and children at times