Wristcutters: A Love Story (2007)

Storyline:
Zia, distraught over breaking up with his girlfriend, decides to end it all. Unfortunately, he discovers that there is no real ending, only a run-down afterlife that is strikingly similar to his old one, just a bit worse. Discovering that his ex-girlfriend has also "offed" herself, he sets out on a road trip to find her.