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Shelton also admitted that he began writing the song before taking his relationship with Stefani seriously.

After all, he had just divorced fellow country singer Miranda Lambert after four years of marriage, and the No Doubt front woman had just ended her 13-year marriage with Gavin Rossdale.

\"When we wrote the song, we never saw it going there. I don't know that we ever really saw it going anywhere,\" he explained. \"I only started the song to impress her; to be like, 'Hey, I’m writing a song about you.'\"

\"And so I sent it to her, and then she wrote the other half of the song. I was like, 'Oh, she just one upped me,'\" he deadpanned.

Stefani, 46, and Shelton, 39, began dating publicly last November.

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