John Mayer recently joked about being unfaithful to girlfriend Jennifer Aniston.

John Mayer jokes about being unfaithful to Jennifer Aniston.

Now magazine reports the former “Friend” failed to find the humor in his comments.

“One of the things that causes tensions between them at times is the jokes John makes when Jen isn't around,” a source said. “She wasn't happy when he told the audience at his show in California on July 26 that he had a dream he had made out with someone other than her.”

“(John) had to do his penance to his girlfriend by singing ‘Dreaming with a Broken Heart,’” the audience member said.

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