By Jon Boon - Breaking Celebrity News Reporter

Katy Perry is wishing she never fell for John Mayer’s charms and she’s embarrassed that the lusty lothario used and abused her, Breaking Celebrity News is exclusively reporting.

As we told you, the Wide Awake singer’s heart was broken in two when the 34-year-old axeman dumped her after just weeks of dating.

And the subject is off-limits for her friends and family, who were the first to warn Katy, 27, not to get involved with the serial womanizer.

“Katy fell hook, line and sinker for John, so when he broke it off she was ultimately surprised and incredibly embarrassed,” a close source revealed.

“She’s ashamed that she got played – it was the classic ladies man move, he added another notch on his bed post. He charmed Katy, got what he wanted and moved on.

“But Katy really liked John, she thought their relationship was the real deal, especially after he told her he wanted to put an end to his womanizing reputation and was thinking of settling down.

“Family and friends did their best to dissuade Katy from hooking up with John because they were concerned that he was going to treat her like his other conquests.

“Now, Katy is keeping mum on the subject and won’t have anyone tell her, ‘We told you so,’” the source said.

As Breaking Celebrity News exclusively reported, John ditched Katy and the pair are no longer on friendly terms, despite his claims he’s a reformed man.