"It was a slap in the face to Bella," the source says, claiming that Disick embarrassed her by bringing her to France, then canoodling with other women.
As for Disick's current state of mind, the source says his friends are "concerned" for him.
"Obviously, everyone is concerned and wants to make sure he's healthy and happy," the source shares. "His friends know these binges aren't good for him. This is behavior that he's worked really hard at to try and subdue, but he keeps on going back to it."
Last week, a source close to Kardashian and Disick told ET that Disick had "gone off the deep end again," and that he "goes into the dark, depressed stages" where he "turns to partying for help."
"When Scott starts partying, he can't stop," the source claimed. "There is no middle ground for Scott -- it's go all in or none at all. This is how he has always been."
"[Kourtney] has been through this so many times before and does love him; he's the father of her three children," the source added. "She's worried this won't ever stop and hopes he gets the help he needs."