Kourtney Kardashian's ex spent Wednesday night clubbing at a Los Angeles hot spot

By Michele Corriston; Melody Chiu and Steve Helling
Updated September 17, 2015 06:45 PM
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Credit: AKM-GSI

It seems Scott Disick is back to his partying ways – and enjoying the single life.

Kourtney Kardashian‘s ex spent Wednesday night clubbing at a Los Angeles hot spot, arriving around 11 p.m. and staying until nearly 2 a.m.

An onlooker describes Disick, 32, as “already wasted” and a “mess,” adding that he brought women back to his table.

“It was shocking and embarrassing,” the source tells PEOPLE. “He had the whole ‘Lord Disick’ shtick on all night and was acting like a total d——–.”

Disick’s manager has not returned PEOPLE’s request for comment. But another source close to the Keeping Up with the Kardashians is concerned about his behavior.

“He doesn’t have anyone to keep him in check,” the source tells PEOPLE. “He’s not interested in accountability. He’s just going wild. A lot of people are trying to help him but that’s not what he’s looking for right now.”

In a video shot by TMZ, he slurred his words and acted confused by two women sitting in the car waiting to whisk him home.

“Who’s in the damn car?” he asked his bodyguard, who admitted he didn’t know “these girls.”

“This does not look good for anybody,” said Disick as paparazzi cameras flashed. “Get in the back seat then, honey.”

Disick and Kardashian, 36, split in July after he was photographed drinking heavily and cozying up to another woman. They were on and off for nine years and have three children together: Mason, 5, Penelope, 3, and Reign, 8 months.

“He isn’t working on himself, which is one of the conditions he has to meet for Kourtney to take him back. He’s not working on himself at all,” a source close to Disick told PEOPLE earlier this week. “Everyone is very worried about him. Whatever his problems are with the family, no one wants him to be hurt.”