Robert Pattinson, Kristen Stewart Split After Fight? Actress 'Heartbroken'

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(Photo: Reuters/Mario Anzuoni)Cast members Robert Pattinson and Kristen Stewart pose at the premiere of the movie "Twilight" at the Mann Village and Bruin theatres in Westwood, California November 17, 2008. The movie is based on the novel of the same name by Stephenie Meyer and opens in the U.S. on November 21.

Robert Pattinson and Kristen Stewart have reportedly split following reports of an alleged argument on the actor's birthday.

The "Twilight" stars, who have dated on-and-off since 2008, were torn apart for months in July after Stewart, 23, publicly admitted to cheating with a married man. By November the pair reconciled although eventually they reportedly began living "separate lives."

"They again went from spending every second together, to spending more time apart at their separate houses," a source told People magazine.

"Kristen has been in a terrible mood, and it was obvious that things were not great with Rob," the source explained.

Pattinson, 27, celebrated his birthday on May 13 and Stewart was nowhere in sight. Sources claim the duo had been experiencing relationship trouble for weeks.

"It was very strange that they didn't celebrate Rob's birthday together. He had friends over at his house, but Kristen was not part of the celebration," the source revealed adding "For the past few days, they have not spent any time together."

Stewart, who previously apologized for her secret tryst with her "Snow White and The Huntsman" film Director Rupert Sanders, is said to be "heartbroken" and "so sad" over her split from Pattinson. The actress will reportedly continue living with Pattinson at her Los Feliz, CA., mansion.

"They are going to stay living at Kristen's house because of the dogs," a source told E! Online. "It's not fully over or he would have moved out."

Pattinson reportedly had a difficult time moving past Stewart's cheating scandal, with a source claiming the trust was lost.

"He's not as into it as he was before the cheating— not giving her special treatment like he used to. She feels unloved and that's why they fought," a source said.

A paparazzi photographer recently claimed the actress appeared to be distressed during what he alleged looked like an intense phone conversation on Pattinson's birthday.

"Kristen was pacing back-and-forth in her friend's apartment, smoking. She looked really upset, talking on the phone for almost an hour— I'm guessing she was talking to Rob," the unnamed photographer told X17 Online.

"She was really animated, like she was trying to explain something. She was getting frustrated and seemed very emotional," he added.