Co-written and produced by notable names including David Hodges formerly of rock band Evanescence, the lyrics and concept was changed to fit her perspective of past relationships.

[6][1] In an interview with NME, Perrie revealed that Ed Sheeran originally sent her a demo for 'Forget About Us" and she later changed the concept and lyrics of the song to fit her style.

Prior to its release date it had been described by NME as a "sun-dappled stomper with a powerhouse vocal,[4] while Billboard further described the single as "having Katy Perry and Kelly Clarkson vibes".

[1] It is a pop ballad[7] single with influences of country music[5][8] and lyrics addressing past relationships and friendships written from Perrie's perspective.

[5] Holly Allton with The Shields Gazette named it as "song of the summer" and hailed it as "the perfect pop debut" with some country influences.

[11] Writing for Attitude, Alastair James gave praise to Perrie's vocal ability and described it as a "pop tune, perfect for the summer", with lyrics which offers a mature take on relationships.

[8] Perrie embarked on a promotional tour for the single attending fan events and radio stations in France, the UK, and Amsterdam where she also spoke about her upcoming debut album.