We all know that Taylor Swift writes her songs from personal experiences. We also know that when she is dating someone, they better be nice or their actions will be revealed in a song for the whole world to hear!

But, I guess John Mayer didn't know that. He was interviewed in the latest Rolling Stone magazine and he says he felt  horrible and humiliated after he hear Taylor's song "Dear John" from her Speak Now album.

Mayer says he didn't even know how Taylor felt until he heard the song.

“I never got an e-mail. I never got a phone call,” he says  "I was really caught off-guard, and it really humiliated me at a time when I'd already been dressed down. I mean, how would you feel if, at the lowest you've ever been, someone kicked you even lower?"

“It made me feel terrible,” the singer says of ‘Dear John,’ insisting, “Because I didn’t deserve it. I’m pretty good at taking accountability now, and I never did anything to deserve that. It was a really lousy thing for her to do.”

Mayer also attacks Swift's songwriting.

“I know she’s the biggest thing in the world, and I’m not trying to sink anybody’s ship,” he said. “But I think it’s abusing your talent to rub your hands together and go, ‘Wait till he gets a load of this!’ That’s bulls*&%t.”

Hey John, tell us how you really feel!  Oh, and I think I'll go ahead and thank you for material for another Taylor Swift song! :)

If you haven't heard the song ‘Dear John’  here it is!