A month after Angelina Jolie filed for divorce from Brad Pitt, the mother-of-six is gearing up for an intense custody battle as she continues to paint her estranged husband in a negative light.

A source close to the situation tells Life & Style, "Brad has engaged in a pattern of angry behavior. This is one big reason why Angelina wants sole physical custody of the kids."

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And while the 52-year-old actor's alleged blowup on the family's private jet is the straw that broke the camel's back, Angelina has been worried about his temper for months.

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"She didn't pull the plug on this marriage because of one incident," the source adds. "Look at the overall situation. This has been a long time coming."

For more on Brangelina’s split, pick up the latest issue of Life & Style, on newsstands now! And scroll through the gallery below for a look at the couple’s cutest quotes about each other.