OK! Exclusive: Scott Disick Does Not Believe Reign Is His Son Amid Buzz That Kourtney Kardashian Cheated!

Well, it looks like Scott Disick may not be the only one facing cheating rumors these days! It looks like he suspects Kourtney Kardashian cheated on him months ago, and that he isn’t the father of son Reign!

An insider tells OK! exclusively, “There’s been buzz in their circle that Kourtney cheated and Reign might not be Scott’s. He flipped when he heard it, and he’s been off the rails ever since.”

This may explain why Scott is often seen out with kids Mason and Penelope, but has yet to be photographed with the toddler. “He’s behaving strangely. There’s definitely something going on,” the source adds.

And this is not the first time Kourtney’s been accused of cheating, though she was able to prove in the past that the accusations were false. Back in 2013, model Michael Girgenti was adamant he slept with Kourtney while she was on a break from Scott and he fathered Mason.

The accusations were disproven when Kourt released a paternity test, but the damage was done. The situation “planted a seed in Scott’s mind, and he’s never totally believed that Kourtney wasn’t playing around behind his back,” says the source.

And while she may not have slept with the model, the reality star may not be completely innocent.

“Scott’s not the only one who was up to no good,” claims an insider, adding “she’s definitely acting as though Reign is hers, not theirs. It’s just a really sad situation for everyone.”