The 19-year-old singer, who dated pop star Taylor Swift and 'X Factor' presenter Caroline Flack, said he is yet to find 'the one' for him, reported Contactmusic.
"I think you know when you find someone, I guess. I think, just someone who is nice," he said.
Asked if he feels awkward meeting ex-girlfriend Swift and rumored fling Cara Delevingne on the same catwalk at the Victoria's Secret this week, he said, "I'm friends with them.