Scott Disick is 'going crazy' over Kourtney Kardashian's engagement to Travis Barker

He's having a difficult time moving on.

And Scott Disick, 38, is reportedly 'going crazy' after Travis Barker proposed to the mother of his children, Kourtney Kardashian, at sunset on Sunday night in Montecito. 

Insiders told Page Six that Disick, who recently broke up with ex-girlfriend Amelia Hamlin, 20, is not in a good place after hearing the news of the engagement despite having split from the eldest Kardashian daughter more than five years ago.

Trouble in paradise: Scott Disick is reportedly 'going crazy' after Travis Barker proposed to the mother of his children, Kourtney Kardashian, at sunset on Sunday night in Montecito

'Scott is going crazy,' an insider told the publication. 'He's going to go off the deep end. It's really bad. It's about to get dark.' 

The Blink 182 drummer dropped down to one knee and proposed to Kourtney on the beach overlooking the sunset in Montecito on Sunday night with her famous family looking on from the Miramar hotel.

Disick then became a trending topic after fans were curious about his reaction following his disastrous leaked direct message to her ex, Younes Bendjima, where he criticized Kourtney for too much PDA with Travis on their trip to Italy. 

'Yo is this chick ok!??? Broo like what is this. In the middle of Italy,' Scott wrote as he sent a photo of Kourtney kissing and straddling the Blink-182 drummer on an inflatable boat.

Bendjima, 28, responded back: 'Doesn't matter to me as long as shes happy. PS: i aint your bro.'

All the small things: The Blink 182 drummer dropped down to one knee and proposed to Kourtney on the beach overlooking the sunset in Montecito on Sunday night with her famous family looking on from the Miramar hotel

The way they were: Amelia reportedly 'ended things' with Scott in September after nearly one year together

Yikes: Things were certainly tense leading up to the split, when just last week, the Talentless designer sent Kourtney's ex Younes Bendjima a direct message about her PDA-packed behavior with boyfriend Travis Barker

Kourtney and Scott dated on and off for nearly a decade and had three children together — Reign, six, Penelope, eight, and Mason, 11 — before officially ending things romantically in 2015.

He's remained an active co-parent and friend of the family appearing on Keeping Up with the Kardashians and at every major familial event through the years despite his relationship status. 

Travis' ex-wife, Shanna Moakler was certainly in her feels as well when she took to Instagram on Sunday night hours after the engagement with a dramatic reaction as she admitted to being 'temporarily closed for spiritual maintenance.'

The 46-year-old former pageant queen has had a contentious time with Kravis, and even at one time admitted that their romance was 'putting a wedge' between her relationship with her kids.

In the past: Kourtney and Scott dated on and off for nearly a decade and had three children together — Reign, six, Penelope, eight, and Mason, 11 — before officially ending things romantically in 2015; seen in 2015

Travis famously filed for divorce from Shanna in 2006 after just two years of marriage following claims that she had been unfaithful.

Earlier this year, Shanna decried her exes very public new romance and told Us Weekly that it's negatively affecting the bond she has with her two kids.

'The Kardashians are buying my kids Prada every other day,' the former Miss USA told the publication.

'They're going on lavish trips. They're doing all these things, which is fine. I think it's nice that they're being kind to my kids. I want that for my children.'

Love lost: Travis famously filed for divorce from Shanna in 2006 after just two years of marriage following claims she had been unfaithful; seen in 2005

She noted that there's 'severe distancing' between her and Alabama, 15, and Landon, 18, and noted: 'I don't think it's great when they put a wedge in between their biological mother.'

Kourtney went public with her new romance at the beginning of the year, and has Reign, six, Penelope, eight, and Mason, 11, with Scott.

Shanna also recently told US Weekly that his infidelity with Kim Kardashian was the catalyst to finally end their relationship.

'I divorced my ex because, I saw them — I caught them having an affair,' she said.

Shanna added that she 'saw text messages' between the pair and alleged the 'affair' took place before Keeping Up With The Kardashians premiered in 2007.