Kourtney Kardashian split with boyfriend Scott Disick over the Fourth of July weekend, sources tell E! News.

"Kourtney has always taken Scott back and been by his side, but now with three kids it has gotten old," one source says. "Kourtney has to do what's best for the kids."

Another source claims that "Scott has been running around saying he's single. Kourtney dumped him after she saw the pics in Monte Carlo and he hasn't been home after a month-long party binge." The pics in question are of Disick getting cozy with L.A. stylist Chloe Bartoli.

This is not the couple's first split; the two briefly parted in 2010 when Kourtney suspected that Scott had a drinking problem. He has been to rehab twice, with a short stay in 2014 and again this past March.

Another source claims that Disick has been spending too much time with friends who are "are not a good influence" on him and "not looking out for his best interests."

The couple have been dating since 2006 and are the parents of Mason, 5, Penelope, 3, and Reign, who is six months old.