The 23-year-old has previously dated string of men including Joe Jonas, Taylor Lautner, John Mayer, Jake Gyllenhaal and Harry Styles, reported Showbizspy.
"I am getting to the point where the only love worth being in is the love worth singing about. And kind of mad love. I think that for me, when you experience something that's worth writing a song about, chances are it's the same kind of intense feeling that someone else has felt, and it has led them to be sitting on a bedroom floor crying, or walking through a crowded room feeling alone or feeling misunderstood by the person who's supposed to know them better than anybody else.