The reason behind the breakup of Rob Pattinson and Kristen Stewart was because they had a huge argument about Kristen's cheating! Rob and Kristen broke up after they had a massive fight over text messages on Kristen's phone from Rupert Sanders. Can celebrity couples really ever get over a cheating scandal? Some have.

KPats, Kristen Stwerat and Rob Pattinson, suddenly broke up for the second time right after Rob's 27th birthday. It seems Rob can not get over Kristin's cheating scandal.  But with allegations of text messages on Kristen's phone from the man Kristen cheated on Pattinson with, who can blame him?

"No one wants to grill Rob on this and he's not sharing the details, but we all know they had a massive fight," the source reveals. "All he's said is that he can't trust her anymore and he never will - seems pretty obvious they were fighting about her cheating."

The source adds, "I know she promised Rob that she'd cut things off with Rupert completely - that was a part of the deal - so if Rob found out she was still talking to him, that would be it for him. He's not going to let her humiliate him twice!"

A source tells The Sun:

Rob was looking at her phone on the morning of his birthday as he wanted to take a picture of something when she was in the shower. Suddenly this message flashes up and it's not what he wanted to see. He got straight up and left. Despite Kristen's pleas, he told her not to come to his birthday party at a friend's that night. He's extremely angry and upset. No matter how many times she calls or texts, friends say he's had enough. After everything that happened and the hurt she caused, he's furious she'd be back in touch with him, even if she is saying it's completely innocent.

Photos of Pattinson packing up his red truck with suitcases suggest he' no longer living with his former "Twilight" co-star.

"They are basically allowed to date other people and Kristen is super sad over the whole thing. She has absolutely no desire to date anyone and the thought of Rob possibly seeing other people has made her sick to her stomach," said a friend of Stewart's.

"She's depressed and rightly so. Her good friends have been hanging out with her at her house giving her support. This is a tough time for both of them. But Kristen seems to be taking the split the hardest."

Rob Pattinson doesn't seem to be able to forgive Kristen Sterwart for cheating. While most celebrity couples can not get passed a cheating scandal, some famous couples have managed overcome infidelity.

Former President Bill Clinton and First Lady Hillary Rodham Clinton managd to get passed the highly publicized chating scandal with Monica Lewinsky. In Hillary's memoirs, published in 2003, Hillary wrote that one of the most difficult decisions of her life was to stay with her husband and confessed that initially she wanted to "wring Bill's neck." Ultimately, time and his political assistance as she launched her Senatorial campaign helped mend the relationship between the couple, who have been married since 1975.

David Letterman and Regina Lasko recently faced a $2 million extortion plot stemming from Letterman's affairs with female members of his staff. He issued a public apology to his wife and said of the relationship post-cheating, "Maybe it won't be the same, but maybe it will be different and maybe it can even be better in a different way." It seems this approach to reconciliation is working for the couple.

Although never confirmed Scott Disick and Kourtney Kardashian faced allegations of unfaithfulness throughout the course of their five-year relationship. Kardashian no doubt drew strength from her close-knit family and after two babies, the couple appear stronger than pre-allegations.

Although getting over infidelity seems impossible, these celebrity couples have proved it can be done.  Can KPats make it through the cheating scandal or are they doomed to fail?