"When She Was Mine" is the debut single released by British pop rock band Lawson, via Polydor Records. The single was released in the United Kingdom on 27 May 2012, as the lead single from their debut studio album, Chapman Square (2012), and reached #4 on the UK Singles Chart.

A music video to accompany the release of "When She Was Mine" was released on 11 April. Directed by Declan Whitebloom at a total length of three minutes and forty-seven seconds. The video features the band performing the track in a high-rise building, looking out onto the street below, where a girl and her new boyfriend are courting. Lawson explained that the song was formed on the basis of the relationship between band member Andy Brown and his ex-girlfriend, Mollie King of The Saturdays.

Lewis Corner of Digital Spy gave the song a positive review stating:

"What I miss the most/ Is talking up all night/ We laughed until we cried," Andy reminiscences over pop-rock guitars and beats that fall somewhere between the soul of Maroon 5 and The Script's knack for a worryingly catchy melody. "Now I'm breaking at the seams/ Dropping to my knees/ Nothing left of me," he confesses of his loss, before bursting into an ear-snagging chorus. Fortunately, we suspect the silver lining of this particular cloud is just about to shine. .

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Wikipedia