The 26-year-old singer worked with Gomez on the hit track We Don't Talk Anymore back in 2016.
In an interview with Billboard magazine, Puth admitted it was hard to date her because she had someone else on her mind.
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Puth said, "It's about a particular moment in my life, when someone very close to me wanted the Attention of somebody else. When I found that out and we ended it, I might have done some shady things too, and she might have asked me, 'How Long has this been going on?'"
"I don't kiss and tell, but the only way a song like that can come across as real is if there's something else going on behind the scenes. And that's what was happening.
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Talking about his romance with Gomez, the See You Again crooner revealed, "Very short-lived, very small, but very impactful. And it really messed me up. I'm trying to put this the best way possible: It wasn't like I was the only person on her mind. And I think I knew that going in - what I was getting myself into."
He takes a deep breath and slumps down. "You gather up a bunch of emotion with the life shovel, throw it in the life bucket, mix it up," he says with a shrug.
Puth continued, "And she evoked such good emotion on that song, it was a pleasure working with her. That's why I'm always happy to sing it, even though it came from a dark point in my life."
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