Scott Disick should avert his eyes away from Travis Barker's Instagram page immediately, because the star just admitted he "doesn't like" seeing Kourtney Kardashian with another guy.

Just days after Kourtney's new boyfriend Travis shared some serious PDA of the couple on social media to celebrate her birthday, her ex Scott made the admission in an episode of Keeping Up With The Kardashians.

In the clip, Scott and Kourtney, who share three children, were talking about a recent trip to the beach. "I feel like it annoys me when you flirt with this lifeguard," Scott said.

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"In my head seeing you around any guy bothers me. Maybe it's just something, I don't know. I feel like you're a little flirty," he continued. "Then it's my insecurity that I feel like I just don't like seeing you with another guy."

While Kourtney denied flirting with the lifeguard, Scott continued, "It hurts me when you're with somebody else. Waking up to, like, looking at pictures of you with this guy you were dating...it's just unhealthy. It made me upset and sad, you know what I mean?"

It's worth noting the episode of KUWTK was likely filmed before Kourtney and Travis started dating, and also before Scott Disick got into a relationship with Amelia Hamlin.

In the confession, Scott added "It's definitely difficult that Kourtney and I basically spend 90 percent of our lives together, travel together, do everything together, see each other every day, and the only difference is at the end of the night we part ways and go and sleep in separate houses.

"This whole limbo state isn't that cool anymore. And I surely don't want us both to wake up and be 50 years old and doing the same thing."

He probably doesn't want to watch the video of Kourtney sucking Travis's thumb right now, then.

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