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EXCLUSIVE -- Scott Cheated on Kourtney: The Final Straw

Scott Disick Cheating

Credit: Picture by: XactpiX/Splash News

Welcoming third child, Reign Aston, on Dec. 14 was a much-welcomed window of calm and affection for Kourtney Kardashian, who has long put up with reports of boyfriend Scott Disick’s hard partying and flirtatious behavior. Sadly, that window will close quickly for the reality star, when she discovers the latest and most heartbreaking claim concerning her bad-boy baby daddy!

As Star has exclusively learned, a source close to Scott claims he hooked up with a stunning brunette he met in Miami in late 2012, while he and Kourtney were there filming Kourtney and Kim Take Miami. “Scott’s wild ways have pushed Kourtney to the limit time and time again,” the source says. “Now she has to face a new claim that he cheated on her right behind her back! How much more can she be expected to take?”

According to the source, Scott and the twentysomething sparked after meeting and ended up having a steamy affair. “Scott definitely wasn’t faithful to Kourtney during that time in Miami,” claims the insider, who passed a polygraph test at Star’s request. “But be came incredibly close to being busted one time when he was in bed with the brunette — and an ex-boyfriend of hers burst into the room! I’m not sure what kind of confrontation that ultimately turned into, but Scott managed to get out of there as fast as humanely possible.”

The source also claims that Scott ended up buying his lover a Mercedes-Benz and paying her $200,000 “as hush money to make sure she kept quiet about everything.” When contacted by Star, the woman in question admitted that she had seen Scott at a nightclub in Miami and that she drives a Mercedes — but denied having sex with him.

However, the source says: “She and Scott had an understanding. I wouldn’t be surprised at all if they hooked up again since then, any time that Scott has been in Miami.”

Meanwhile, Scott and Kourtney have been close to the breaking point over his carousing for quite some time. As recently as Nov. 22, after he left his heavily pregnant gal behind to party in Las Vegas, Kourtney tweeted the cryptic message: “If you want to leave you can. I’ll remember you, though. I remember everyone that leaves.”

“Kourtney can put up with a lot — and she has, by every measure — but when it comes to outright cheating, she won’t accept it,” the insider adds. “Whatever bit of trust they still had will be broken by this scandal, and I have no doubt that when Kourtney learns of Scott’s Miami hook-up, she’ll finally admit, ‘I always knew Scott was a cheater.'”

MORE LINKS

Kourtney Kardashian’s Worst Nightmare: Kendall Pregnant with Scott’s Baby!

Scott Disick and Kendall Jenner’s Secret Romance!

Kourtney Kardashian Shows Off Baby Bump in Nude Photo Shoot