Taylor Swift has made a successful career out of writing about love, but there's still plenty of things she doesn't understand about romance.

The songstress, who graces the cover of the January issue of Cosmopolitan UK, told the magazine of relationships, "[I don't know] how to make them last. I've never had a really long relationship, so I have no idea what that's like. Wish me luck for the future!"

Fingers crossed that all goes well for her rumored romance with One Direction's Harry Styles! Taylor has been linked to a number of men over the past few years, and even though Harry is four years her junior, the age gap doesn't seem to be a problem.

"I really don't have any rules about dating when it comes to height, age, career choice, anything like that," she says. "It doesn't matter. It's really more about strength of character. When it comes to age I've been all over the map!"

Despite experiencing plenty of heartbreak along the way, Taylor has learned a few things from her former flames.

"I don't know. I think that idea of love I hope for is that you learn a lesson and you don't have to learn it twice," she says. "But the song 'I Knew You Were Trouble' is about when I knowingly made the same mistake twice. I couldn't resist it -- there's that temptation to push yourself into a risky situation with someone who is going to hurt you, and that's what that song is about: not trusting your own instincts and ignoring all the red flags."

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