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Women everywhere should know not to date him by now!

John Mayer reportedly had a fling with Soul Cycle instructor Lauren McHale after meeting her at an L.A. bar last May, and it could have been a contributing factor in his breakup with Katy Perry, Star magazine reports.

The musician and the pretty redhead apparently after partied the night they met, and took things too far with a steamy make out.

"They kissed. It was very innocent. They didn't sleep together," a source told the mag.

It didn't last long though!

"They texted for a few weeks. Nothing came of it and they haven't seen each other since," the source added.

Just because it happened in the past and John and Katy were supposedly "on a break" doesn't mean it didn't create a problem, because the "Roar" singer allegedly found texts on her beau's phone from a random girl and pulled the plug on their relationship.

What a cliche!