Kourtney Kardashian has "no doubt" Scott Disick is cheating on her

Kourtney is reportedly worried about Scott - who has a history of substance abuse - falling back into his old ways and is fuming with Chloe, as she thinks she is taking advantage of a vulnerable man, TMZ reports.

Meanwhile, a source has claimed the 32-year-old model and television personality - who has five-year-old son Mason, two-year-old daughter Penelope and six-month-old son Reign with Kourtney - is in a "classic shame spiral".

They said previously: "He's in a classic shame spiral right now. He knows he's screwing up, and he knows what he needs to do.

"He has people telling him to go home and work things out, to stop this behaviour, to repent and to move forward. But he's not doing it."

Scott's friends are also said to be "concerned" about the father-of-three.

An insider said: "They fear he is out of control and has fallen off the wagon.

"He is partying hard and they are concerned."