Will John Mayer break Jennifer Aniston’s already fragile heart? That is what some sources close to the couple are anticipating.

A source tells Star magazine that the Wonderland singer is only with Jen for publicity and doesn’t really care about hurting her feelings.

"Her friends are worried that she will get heartbroken, just like all the other girls he's been with," says the source. 

"John tells her she's the one and that he's ready to settle down, but then he tells a different story to his friends."

Will the reign of Tushie and Mayo soon be coming to an end?