"Rob knows how to turn a molehill into a mountain when it comes to his insecurities, and he flips out if anyone brings up sensitive subjects like his weight," an insider noted.
Despite his tendency to erupt, Kardashian's last episode was at least somewhat justified.
"The last thing he lost it over was The Game boasting about sleeping with two of his sisters and Chyna," explained the source of Kardashian, 29.
Still, "Rob's incredibly sensitive, and he's got to learn how to control his temper," insisted the source.
In order to help, 28-year-old Chyna's insisting Kardashian learn some anger management techniques as part of his preparations for parenting.
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