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Tech titan and TechCrunch founder Michael Arrington is known for his virtual outbursts and high temper when it comes to Silicon Valley drama, and his yacht . But an ex-girlfriend now claims that Arrington was violent toward her in real life, and threatened to "murder" her if she told anyone. On Thursday, Jenn Allen, the CEO and founder of start-up RTist.com posted the following public status update to her 4,500 Facebook subscribers: Last post on someone i'm completely over. I've never been lonelier in my entire life. To all my friends who loved me for who I am - thank you.