Who Is Ed Sheeran's 'Don't' Song About?

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Ed Sheeran wrote a song about a "well known" star, but is he singing about Taylor Swift?
Speaking withParade magazine about his track Don't-- labeled as a "bitter song of romantic betrayal"-- the British singer/songwriter insists it's not about the 22 singer. "[It's] about someone who's well known, but not Taylor," the 23-year-old touts.

Seeing as Sheeran denies ever dating Swift, rumor now has it that the song is about his brief fling with pop star Ellie Goulding. Lyrics read: "She told me 'I was never looking for a friend/ Maybe you could swing by my room around ten/ Baby, bring the lemon and a bottle of gin/ We'll be in between the sheets till the late AM."
A little proof that he talking about a musician, Sheeran sings: "But me and her, we make money the same way/Four cities, two planes, the same day."
Who do you think Don't is about?