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Robert Pattinson, Kristen Stewart Fought About Her Affair, “Moody” Behavior Before Breakup

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Kristen Stewart and Robert Pattinson

Maybe he hasn't forgiven her after all. Before their maybe-temporary, maybe-permanent breakup late last week, Robert Pattinson and girlfriend Kristen Stewart fought bitterly for several days — with Stewart's headline-making July 2012 fling with Rupert Sanders coming up again and again.

Related: PHOTOS: How Rob and Kristen weathered 2012 together and apart

"All this stuff came up," a source close to Pattinson, 27, tells Us Weekly of the pair, who began fighting after the British actor blew off a birthday party planned in his honor by Stewart, 23. Dating for about three years, the Twilight costars bickered "about the cheating, about how selfish she always is, about how moody she always is," the source explains.

Related: PHOTOS: All the photos from Kristen and Rupert's fling

(Stewart and her Snow White and the Huntsman director Sanders, 43, were photographed making out in Hollywood last July. Although Stewart and Pattinson reconciled last fall, Liberty Ross, Sanders' wife and mother to his two kids, filed for divorce earlier this year.)

The source adds that Stewart's shocking indiscretion with Sanders was just one point of contention for the pair "It was a lot of issues that came up."

Related: PHOTOS: Moody for sure! Kristen's grumpiest faces

Time will tell whether the young couple will reunite. "[Rob] is so torn . . . They could get back together."

Tell Us: Is this couple better together or apart?

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