Rumors started when: In February of 2010, In Touch magazine reported that Taylor Swift was cuddling with John Mayer in the studio and later went to his hotel suite.
Later, she would record the most cutting (and 'humiliating') of her revenge songs, ' Dear John,' which was obviously about him.
He is a seven-time Grammy Award winner, who has been nominated total of 19 times.
He has quite the reputation in Hollywood for dating some of the biggest celebrities in the world, yet usually ends up looking like the bad-guy when the relationship ends.The scoop: They did something, but it's hard to say they "dated" in the innocent way the word suggests.Mayer's womanizing resume leaves one wondering if he didn't treat her poorly after a short time together.Calvin referenced the apparent bad blood between the two stars in a pop at his ex Taylor on Twitter – but how did it all get started?Neither star has ever 100% confirmed those widely-held rumours of a spat – but neither has flat out denied them, either.It was very well documented in the tabloids, especially when the general public were rooting for them the couple to stay together.Alas, as we’re sure you all know, the relationship officially ended in 2014. “I don’t want to be rude to him…because it always comes to bite me in the ass,” Perry told Rolling Stone in August 2014.While Taylor Swift's pals were celebrating her 27th birthday on social media on Tuesday, the "Shake It Off" singer's ex-boyfriend, John Mayer, was throwing shade at the day. "Looks like I shouldn’t have deleted this tweet…" he wrote. EXCLUSIVE: John Mayer Talks New Music, Accidentally Reveals Upcoming Album Title When speaking to Rolling Stone in 2012, Mayer admitted that he wasn't too pleased with the song. I never got a phone call," he said of Swift releasing the track."Tuesday, December 13 may be the lamest day of the year, conceptually," the 39-year-old singer tweeted. Swift dated Mayor briefly from November 2009 to February 2010. "I was really caught off-guard, and it really humiliated me at a time when I'd already been dressed down.Mayer promptly deleted the tweet but not before screenshots were taken and reshared. After the two split, Swift penned "Dear John" that included some pretty telling lyrics. I mean, how would you feel if, at the lowest you've ever been, someone kicked you even lower?After being accused by some of dissing Swift, he clarified his message, writing: "NOPE. " Despite their differences, Swift and Mayer still run in the same circles.