Taylor Swift is a walking anomaly. She's risen to the top of the charts with songs about love and loss, while at the same time assuring the public that she's absolutely loving being single. On 'The Tonight Show' with Jay Leno on Monday (Feb. 20), Swift opened up a bit about her Grammy-winning song 'Mean' and gave some insight into one of the reasons she is perhaps so content to be living the single life for a while.

“I’m a Sagittarius, and it says one of our major qualities is that we’re blindly optimistic," she tells Leno in the clip below. "So when I’m in love, I’m just stupid about it, and I trust people – constantly. And then I always am like, ‘I’m not gonna trust people anymore. I’m gonna be one of those dark, twisty girls who guys love because they’re all like guarded and stuff.’ And then I just trust people again."

This moment of truth came just after Leno asked the country starlet about her quote in her recent 'Vogue' cover story, where she said, "I'm smart unless I'm in love." Speaking of her 'Vogue' experience, Swift gushed about how she was so excited to finally be able to live that dream. "I just loved the whole shoot, working with the coolest photographer and stylist and people," she said. Even when the team cut her hair and put her in a hat, she says she just said 'OK' because that's what you do when you're working with 'Vogue.'

Looking back on her recent two-Grammy win, Swift offered a little explanation behind her hit song 'Mean,' which most people assume to be about an experience she had in high school... but actually has a totally different origin.

“A lot of people think that I wrote it about being bullied in high school, and when the song went out into the world it kind of became that," she explains. "But I actually wrote the song about a critic who kept giving me really bad reviews. Nothing ruins your day like getting a bad review. And then there’s this scathing review which is kind of past constructive criticism, and it’s kind of more into like I hate you territory, which is mean.

While Swift shares that you never develop skin thick enough to handle those reviews, she says she loves hearing that others relate and are able to get out of abusive relationships or bullying situations because they feel empowered by the song. Still, the country star -- who admits to getting her feelings hurt easily -- says she no longer checks her Google alerts to see what people are saying about her.

Watch Taylor Swift on 'The Tonight Show' with Jay Leno