John Mayer, whose ex-girlfriends include Jennifer Aniston and Katy Perry, knows exactly why he's single. READ MORE:* John Mayer brings heart, humility to New Zealand* Can you really have a 'gentle' divorce? * John Mayer using elite dating app to find love: report* Hiddleswift: Romance or showmance? GETTY John Mayer last toured New Zealand in March of this year. It is believed Taylor Swift's 2010 song Dear John is about Mayer, who was rumoured to have dated Swift in 2009, when Swift was 19 and Mayer was 31.

Source: Stuff July 17, 2019 20:48 UTC