Taylor Swift's relationships didn't work out because her famous ex-boyfriends were always trying to compare their success to hers.
Taylor Swift thinks her ex-boyfriends were too ''competitive''.
The country singer - who has dated Hollywood hunks Jake Gyllenhaal, Joe Jonas, Taylor Lautner and John Mayer - claims her showbiz relationships have all ended because her jealous exes couldn't handle her being more successful than them.
Taylor explained: ''I've found that men I've dated who are in the same business can be really competitive. I've found a great group of girlfriends in the same business who aren't competitive, but a few times guys have started comparing careers and it has been... challenging.
''The last thing I think about when I fall for someone is what they do for a living as I like to get to know that person, but sometimes guys start acting weirdly towards me, especially if I get good news and they get bad... It's usually downhill from there.''
The 'We Are Never Ever Getting Back Together' hitmaker is famed for penning lyrics about her ex-boyfriends and she can't believe anyone would ask her not to put down her feelings in music as they should assume it's a ''waiver'' of dating her.
Taylor told You magazine: ''It's mind-blowing how some guys have just handed me inspiration for some of these songs on a plate. Some have said, 'Please don't write about me,' but only when we're in the process of breaking up.
''If a man dates me, he's kind of signing a waiver saying he's cool with me writing songs about him. I write songs about my life: it's not something I've kept secret.''
The blonde beauty - who is now dating Conor Kennedy - says she wasn't always so popular with the boys, however, and struggled to get a date at school.
She admitted: ''I was never a boy magnet at school. There was always the girl all the guys liked and wanted to date, but it was never me.''