By Selena Hill (staff@latinospost.com) | First Posted: May 02, 2013 09:13 AM EDT

Naomi Campell's relationship with Russian billionaire Vladimir Doronin may be on shaky ground, according to new reports.

The New York Post is reporting that the couple's five-year romance may be heading for splitsville as sources say that the supermodel is focusing on her show "The Face" and the real estate mogul was caught flirting with other women in New York City.

"Naomi and Vlad have broken up, and he's been out partying in New York," an unidentified source told the Post.

"Naomi and Vlad have a complex relationship, and sometimes break up and make up," an insider told the Post's Page Six. "In many ways their relationship is like a business arrangement. Naomi brings glamor to his hotels and properties, and he treats her extremely well. But they spend a lot of time apart due to work commitments."

However, the two looked content while on vacation in Miami in March and Campbell threw Doronin a lavish 50th birthday party in India in November.

The couple has been dating since 2008, despite the fact that Doronin never legally divorced his long-estranged wife, Ekaterina. However, the 42-year-old model revealed that she doesn't plan on getting married anyway.

"I am afraid of the word marriage," she told British GQ back in 2007. "I'm afraid of making that commitment and failing because I never want to be divorced. I don't want divorce to enter my whole reality."

The British beauty has been plastered on the cover of the May 2013 issue of Vogue Brazil.

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