Scott Disick admits he doesn't like seeing ex Kourtney Kardashian with other ...

They broke up in 2015 and have both dated several people since.

But Scott Disick admitted 'it hurts' when he thinks about ex Kourtney Kardashian dating other men.

The reality star, 37, confessed his insecurities to his ex in a teaser for this week's episode of Keeping Up With The Kardashians, telling the beautiful brunette he was 'annoy[ed]' when he thought he saw her 'flirting' with someone.

Jealous: Scott Disick admitted he doesn't like seeing ex Kourtney Kardashian 'with another guy' in a teaser for this week's Keeping Up With The Kardashians

Wow: Kourtney seemed a bit shocked by his confession

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Jealous: Scott Disick admitted he doesn't like seeing ex Kourtney Kardashian 'with another guy' in a teaser for this week's Keeping Up With The Kardashians

The duo, who were both single at the time of filming, sat down to chat on the sun deck of the luxurious Malibu beach house the family rented last summer.

Scott cut right to the chase and told Kourtney, whom he shares son Mason, 11, Penelope, eight and Reign, six with, that: 'I feel like it annoys me when you flirt with this lifeguard.'

The mother-of-three seemed a bit surprised, telling Disick she was 'definitely not flirting with the lifeguard.'

Nonetheless, Scott told his ex: 'In my head seeing you around any guy bothers me.'

'Around another human that I'm not flirting with?' a shocked Kourtney asked.

He tried to guilt the Poosh founder for her behavior, telling her: 'Maybe it's just something, I don't know. I feel like you're a little flirty.'

Frustrated, she told Scott: 'I'm not, I promise.'

Though she tried to dismiss his worries, Disick went on telling her: 'Then it's my insecurity that I feel like I just don't like seeing you with another guy.'

Bothered: The reality star, 37, told his ex, 42, 'In my head seeing you around any guy bothers me'

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Bothered: The reality star, 37, told his ex, 42, 'In my head seeing you around any guy bothers me'

Wow: Kardashian seemed to be surprised by Scott's reveal but assured him she wasn't flirting with anyone

Wow: Kardashian seemed to be surprised by Scott's reveal but assured him she wasn't flirting with anyone 

Single: Both of the stars were single when the scene was filmed last summer

Single: Both of the stars were single when the scene was filmed last summer

His insecurities: Though she tried to dismiss his worries, Disick went on telling her: 'Then it's my insecurity that I feel like I just don't like seeing you with another guy'

His insecurities: Though she tried to dismiss his worries, Disick went on telling her: 'Then it's my insecurity that I feel like

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