"He crossed the line for the last time," a Kardashian pal tells PEOPLE
Credit: Seth Browarnik/Startraks

From the very beginning of their nine-year relationship, Kourtney Kardashian and Scott Disick had no shortage of drama between them – as was clearly, painfully documented on Keeping Up with the Kardashians.

But the reality star and mom of three, 36, has finally had enough. “Kourtney is so upset with Scott right now that the thought of taking him back makes her sick to her stomach,” says a source. “He crossed the line for the last time, and there’s no turning back.”

The duo split nearly two weeks ago after photos surfaced of Disick partying and getting close to a former fling overseas, and since then, Disick has yet to return to Los Angeles, where until recently he shared a home with Kardashian and their three children: Mason, 5, Penelope, 3, and Reign, 6 months.

“Kourtney is devastated, but more angry than hurt,” adds the source. “She is seriously turned off just by the thought of him.”

In the current issue of PEOPLE, a production source reveals that the star’s family is fully supportive of her decision to break things off with Disick, 32, who has now canceled two paid club appearances.

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“Kourtney’s family feels she deserves so much better than Scott’s crappy behavior,” says the production source. “They urge her to never take him back.”

For more inside scoop on Kourtney’s life without Scott, pick up this week’s issue of PEOPLE, on newsstands Friday