Taylor Swift's 'I Knew You Were Trouble' is "100 per cent" about Harry Styles. A friend has confirmed Taylor's single 'I Knew You Were Trouble' - one of her famous break up songs about her exes - is about their romance. The source told RadarOnline.com: "Taylor was crushed over Harry the first time they dated, and like she always does, she penned a song about him to deal with her broken heart. " 'I Knew You Were Trouble' is one hundred percent about Harry. She knew he was young and popular with the ladies and wasn't ready for a serious relationship, but somehow hoped she could make it work." The lyrics to 'I Knew You Were Trouble' feature the lines: "I knew you were trouble when you walked in / So shame on me now / Flew me to places I'd never been / Until you put me down." In another part of the song, Taylor sings: "When your saddest fear comes creeping in / That you never loved me / or her or anyone or anything." The source added Taylor was thrilled when she got back together with the pop hunk in October, adding: "She was head over heels for Harry so even though she knew he was bad news for her, she gave him another chance."
