Scott Disick reportedly left Costa Rica a day early after getting into an explosive fight with longtime on-again, off-again partner Kourtney Kardashian and her family.

The Kardashian and Jenner clan embarked on a family vacation to Costa Rica this past weekend and invited Disick to come along and spend four days with his three children Mason, 7, Penelope, 4, and Reign, 2.

But instead of appreciating and treasuring such family time, Disick, 33, betrayed the family by flying a mystery woman out to the tropical location, Us Weekly reported.

"Scott went missing in Costa Rica. After spending the day at the family compound, Scott didn't turn up and went MIA for several hours," a source told Us.

"They started to look for him, and security and production sources told the family that Scott was at production's hotel and rented a room there."

The production member, who was on site with the rest of the crew to film scenes for Keeping Up with the Kardashians, allegedly told Kourtney's mother Kris Jenner and sister Kim Kardashian that Disick was "hiding at a hotel."

Everyone was reportedly "upset he would bring someone he barely knows" to an intimate gathering, the insider said, adding that Disick left Costa Rica shortly after the confrontation and headed to Miami, FL, where he was then photographed lounging by a pool with a blonde girl outside of the Setai hotel on Tuesday, January 31.

Just one day earlier, the self-proclaimed "Lord" was spotted flirting with brunette model Jessica "J Lynne" Harris.

However, the Us source insists neither of those two women were in Costa Rica and a third mystery woman is actually behind Disick's blowout fight with the Kardashians.

"The family is deeply disappointed," the source added. "Kourtney is not upset that he's seeing other women. She's upset he would disrupt the family vacation with the kids there and the whole family there and hide a girl in the hotel."

And how has Kourtney reacted publicly to this little scandal? She shared an uber-sexy photo of herself in a bikini to seemingly show Disick what he's missing out on.

Disick and Kourtney split for good in July 2015 after the club promoter was caught getting touchy-feely with ex-girlfriend Chloe Bartoli.
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Disick has tried to win the reality TV star back on numerous occasions since then.