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Not everyone is thrilled about Kourtney Kardashian and Travis Barker’s engagement. And Kourt’s ex, Scott Disick, might be top of the list of people who are less-than-happy with the news…

Scott Disick and the 42-year-old Keeping Up with the Kardashians star broke up back in 2015 (wow, has it really been that long?!) after nine years of dating.

According to Page Six, an insider revealed that the 38-year-old reality TV star was spiraling over the news of his ex’s engagement.

“Scott is going crazy,” the insider said.

“He’s going to go off the deep end. It’s really bad. It’s about to get dark.”

Many other sources close to Scott Disick and the Kardashians have echoed this, adding that he is taking the news even harder because he is currently single.

(FYI, he and Amelia Hamlin broke up last month after 11 months of dating. It was widely speculated that the 20-year-old couldn’t handle Scott’s obsession with his ex and her relationship with the 45-year-old Blink 182 drummer.)

“Scott is stewing over Kourtney and Travis’ engagement and not happy at all,” another source told Entertainment Tonight.

“He’s lonely right now and not in a relationship, and is very jealous that things are working out for Kourtney.

“Scott would prefer to go back to when him and Kourtney were just getting along as co-parents without anyone else in their lives romantically.”

Although Scott will always be part of Kourtney’s life, as they share three kids – an 11-year-old son, Mason, a 9-year-old daughter Penelope, and a 6-year-old son Reign – a second source told E! News that he doesn’t like being around Kourtney and Travis as a couple. We’re not surprised to hear this, as Kravis are a pretty full-on couple who aren’t afraid of PDA…

“He will always be a part of the Kardashian family but it is hard for him to be around Kourtney and Travis,” the insider said.

“He will always care for Kourtney. She is the mother of his children and no one else will compare to that.”

We have a feeling that this is only the beginning of Scott Disick’s reactions to Kourtney’s engagement, so watch this space…