Cox posted on social media: "10 years ago this guy introduced me to this guy," referring to Sheeran and McDaid.
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In a 2016 interview with People at the BMI Pop Awards, McDaid described his bond with Cox.
"I don't know if you can put a label on what makes us work...
but I know that I've never loved like I love this woman, so if that's enough, then that's enough."
Cox also revealed in a 2017 interview with NewBeauty magazine that she was open to expanding her family with McDaid.
"I know it's crazy, but I would. … I could carry someone else's egg.
I may be one of the older people doing it, but I would love to, with Johnny that is."
In 2024, Cox detailed how their previous engagement ended during an appearance on Minnie Questions with Minnie Driver.
"Three years in, we broke up, and it was really intense. We broke up in therapy.
I didn't know it was coming, whether I should have or not," she recalled. "He just broke up within the first minute.
And I was like, what? We were engaged, and I was so shocked.
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I was in so much pain."