SCOTT Disick admitted he "doesn't like seeing ex Kourtney Kardashian with another guy" as it makes him "upset and sad."
The 42-year-old is currently in a relationship with Travis Barker, while Scott is with Amelia Hamlin.
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On the latest episode of Keeping Up With The Kardashians, the exes find themselves in quite the awkward exchange as Scott, 37, opens up to Kourtney about how she acts around the pool boy.
He said: "I feel like it annoys me when you flirt with this lifeguard," as Kourtney responded, "I'm definitely not flirting with the lifeguard."
Scott continued: "Maybe it's just in my head... seeing you around any guy bothers me..."
"Around another human that I'm not flirting with?" Kourtney asked, as Scott came back, "Maybe it's just something where I feel like you're a little flirty..."
"I'm not, I promise," Kourtney quickly interjected.
Scott chimed in: "Then it's my insecurity that I don't like seeing you with another guy or a guy. It hurt me when you were with somebody else, and like waking up and looking at pictures of you with this guy you were dating. It was just unhealthy and it made me upset and sad."
However, Scott then revealed he "wakes up without a problem, and I'm now carefree."
He confessed: "But, the big fear is if you start dating again, then it goes back to that and I have to feel a different way again and it's just hard. It sucks."
Kourtney and Scott dated on and off from 2006 to 2015. They share three kids: sons Mason, 11, and Reign, six, and daughter Penelope, eight.
At the time of the conversation both Scott and Kourtney were single, but now that has changed.
Kourtney is dating drummer Travis as they both have been quite open about their affection for one another.
In fact, the Blink-182 star recently shared a wild video featuring the reality star sucking on his thumb.
The happy couple also celebrated Kourtney's birthday over the weekend, as in exclusive photographs obtained by The Sun the two spent an intimate moment in the backyard of the Montage Hotel.
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Both stars sat waiting for Travis’s present to zoom past in the sky – a plane with a banner reading “HAPPY BIRTHDAY KOURTNEY!”
As for Scott, he's busy with someone else as well, as he is with 19-year-old model Amelia - the two made their relationship Instagram official before Valentine's Day.
Sources previously told Us Weekly of their relationship: “Scott and Amelia are pretty serious. She is over Scott’s house very often and spends quite a bit of time there.”