Birthday girl Jessica Simpson is having a tough time getting over John Mayer and his acoustic guitar. The former MTV reality star has enlisted her personal trainer Harley Pasternak in a ploy to rekindle her flame with J.M.

Jessica and John, who dated for 10 months before calling it quits in May, are both clients of hot Hollywood trainer Harley Pasternak. And Jess, 26, has been spilling her secrets about her love life to Harley in the hopes he passes the information on to John, according to Star Magazine.

“It’s a strange tactic – but Jess hopes it will make John jealous and win him back,” said the insider. “She’s been filling their workouts with talks of her ‘busy love life,’ even going as far as showing Harley photos of guys she’s been dating.”

“When Harley told John one of the stories, John merely laughed and said: ‘This is why I broke up with her! She has to resort to these high school games. It’s absolutely immature and childish.”