A new report claims that the Olympian broke up with Tiger Woods because he wasn't faithful.
Did Tiger Woods cheat on Lindsey Vonn?
The bombshell report claims the real reason Woods and Vonn broke up was because he had a fling with another woman.
READ: Tiger Woods' Ex-Mistress Warns Lindsey Vonn Of His Cheating Ways
A friend of Woods is quoted as telling DailyMail.com, "He had a relapse in the sex department. He can't help himself."
The one-night-stand reportedly took place in February around the time Woods withdrew from a tournament in California because of a bad back.
READ: Sex Addict Weighs in On Tiger Woods's Sex Addiction
Woods supposedly confessed to Vonn. "That 'one-time slip' was enough to send Lindsey packing," DailyMail.com says.
Our calls to Woods' and Vonn's reps were not returned.
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