What about Haggard?
Haggard is a 2003 independent comedy film based on the true story of how Ryan Dunn's promiscuous girlfriend cheated on him. The film was financed, directed & produced by Bam Margera.
Summary: Dunn stars as a depressed man obsessed with his promiscuous ex-girlfriend Glauren who has been having a secret affair with local burnout Hellboy. Rather than confront Glauren about the alleged dalliances, Dunn enlists pals Valo and Falcone to spy on her and find out just what it is she's been up to.