“Happier” is a collaboration written by Bastille and produced by Marshmello, and marks the first collaboration between two artists. It tells the story of someone reflecting on a failing relationship. The artist acknowledges the pain of seeing their partner with someone else, however, he knows the only way to make his lover truly happy is to leave them.

A teaser is shared on social media before its release. The artwork for the single was revealed that the primary artist would be Marshmello with Bastille as a feature. There had been some debate on this matter due to Bastille’s upcoming third album.