Kourtney Kardashian is really splitting up with Scott Disick this time. Recently, photos surfaced of Disick flirting and spending too much time with his ex-girlfriend, stylist Chloe Bartoli in Monte Carlo - which most likely prompted the split.

An Entertainment Tonight insider who is close to the couple said that the two broke up sometime during the Fourth of July weekend while Scott was busy partying, and Kourtney was spending time with their three children: Mason, 5, Penelope, 2, and Reign, six months.

The source says that Disick has been spending a lot more time with peers that "are not a good influence" and are "not looking out for his best interests."

Meanwhile, sources tell E! News Kourtney's reason for the breakup. "Kourtney has always taken Scott back and been by his side, but now with three kids it has gotten old. Kourtney has to do what's best for the kids."

Another source added, "Scott has been running around saying he's single." The insider also reveals that Scott hasn't returned home for a month.

The sources explains, "Kourtney dumped him after she saw the pics [in Monte Carlo] and he hasn't been home after a month-long party binge."

Any "Keeping Up With The Kardashians" fan would know that Scott Disick has long been troubled. He's been suffering from alcoholism - Scott was admitted to a rehab facility back found in Costa Rica back in March.

Not only that, the couple actually broke up back in 2010, which was documented on "Kourtney and Khloe Take Miami" allegedly because of his substance abuse problem with alcohol. After resolving his issues, Kourtney and Scott reconciled later that year.

Although Kourtney Kardashian has long defended Scott and told E! News earlier this year about his improved progress, the good behavior seemed as though it would never last long with Scott - given his binge partying ways.

Sources say that Kim Kardashian's older sister "fear [Scott] is out of control and has fallen off the wagon." Even though Kourtney "is putting on a brave face," she's definitely "over it."

"She's fed up. It's humiliating and disrespectful. How much more is she supposed to take?" said one source.

Whatever specific reason might have led to the break up, Kourtney has definitely been filled to the brim and is not taking Scott's antics anymore.