As the old saying goes, “once a cheater, always a cheater.”

Tiger Woods, 39, allegedly cheated on his ex-girlfriend Lindsey Vonn with pro-golfer Jason Dufner’s 27-year-old ex-wife, Amanda Boyd.

“Even though Tiger dated Lindsey for years, he had a ‘thing’ for Amanda. At first, it was just innocent flirting, but earlier this year it became serious,” a source said via Radar Online.

tiger woods lindsey vonn

Tiger Woods and Lindsey Vonn

“Amanda is gorgeous, and she’s known as a big flirt with the other players on the PGA tour. I guess her flirty ways and good looks caught Tiger’s eye,” another source adds.

The 30-year-old allegedly dumped Tiger after she caught him cheating with Amanda. She announced the pair's split after three years of dating back in May via Facebook.

The golf pro followed suit with his own statement posted on his website, and shortly after was hit with cheating allegations.

jason dufner amanda boyd

Amanda Boyd and Jason Dufner

Jason, who divorced Amanda back in April, was reportedly “devastated” to hear of the tryst.

“Right now, the only sure thing about Amanda and Tiger’s relationship is that it will end with Tiger cheating on her!”