The Exes - Pagan Kennedy

A week after Hank and Lily decide to break up, they start a band together and come up with a unique gimmick: the band will be made up of ex-girlfriends and boyfriends. But as soon as THE EXES go on tour, the band finds out it's not so easy to share a motel room with your old flame. The novel is told from four different viewpoints as the characters try to cope with working together and examine the new emotions triggered by being on the road. Jealousies flare and intimacies renew as they discover each other's foibles, failings and fuck-ups.