AceShowbiz - Scott Disick is "crazy jealous" of Kourtney Kardashian and Younes Bendjima's relationship. The 34-year-old restaurateur isn't happy that his baby mama has fallen for her 23-year-old boyfriend.

"Scott really isn't happy about Kourtney dating Younes. He hates the fact that Younes is younger, and hotter, and it drives Scott crazy jealous that Kourtney is clearly really into him," an insider tells HollywoodLife.com, "Scott has always assumed that Kourtney would be there waiting for him, no matter what-that he could go off and party, hook up with other chicks, and disappear for weeks on end, and that Kourtney would just take him back."

The insider continues, "It's been a really serious shock to Scott's system to realize that's not the case, and that Kourtney's moved on. Seeing photos of Kourtney and Younes frolicking together on holiday, and seeing how happy Kourtney looks, cuts Scott like a knife. But, let's face it, Scott had his chance, many many times, and each and every time he blew it, so he has no one to blame but himself."

According to the insider, Kourtney tried again and again to give Scott the chance to fix his attitude, but in recent months she has truly given up hope and started a new chapter with Younes.

"After years of putting up with Scott's antics and outrageous behavior, Kourtney finally got to the point where enough is enough. She's truly done with being taken for granted and treated like a doormat. She's really happy with Younes, she's happier than she has been in years in fact-Younes treats Kourtney so well, and makes her feel really good about herself once again. Scott can sulk and b***h all he wants, Kourtney's done with him once and for all, and he has no-one to blame for that than himself," the insider shares.