Scott Disick is reportedly humiliated and believes Kourtney Kardashian is seeking revenge on him through her recent fling with Justin Bieber.

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Kardashian has been hooking up with Bieber for months since calling it quits from Disick, the father of her three children, in early July after photos surfaced of "Lord" getting touchy-feely with his ex-girlfriend Chloe Bartoli in Monte Carlo, Us Weekly reported.

"Justin and Kourtney have been hooking up since late August, early September," a source told Us.

Bieber, 21, has allegedly been bragging about his sexual encounters with Kardashian, 36, which is how the news surfaced to begin with.

"Justin started hanging out with Kourtney alone because she started going out more," the source added.

Disick, 32, has remained very tight-lipped over this new romance, but insiders claim he's not the slightest pleased.

"He's had so many stories about him recently, he has no reason to be pissed. He feels like he has to take the humiliation," an insider said. "Scott feels she's doing this to get back at him and get revenge. He feels he has to take it and can't say anything after all he did to her, but he thinks it's dumb and immature."

Regardless, Disick is trying to play an active role in his children's lives. He's also reportedly crashing on Kardashian's couch while he searches for a new place to live.

"He's still sober and he's great with the kids, and Kourtney is happy that he's so involved," another insider told the magazine. "He's more involved now than he was before."

Kardashian's children with Disick are son Mason Dash, 6, daughter Penelope Scotland, 3, and son Reign Aston, 1. Reports have circulated Kardashian will never take Disick back even though he recently completed a stint in rehab and is doing a great job of co-parenting.

About The Author: Elizabeth Kwiatkowski
Elizabeth Kwiatkowski is Associate Editor of Reality TV World and has been covering the reality TV genre for more than a decade.