Looking for a film that has the main character suffering from anger issues, and stops taking his medicine for it, and gets worse and worse. He has a wife that also happens to cheat on him with a friend I think, or it’s just a random guy. Anyway he ends up doing something bad, I can’t remember much. However his wife gets kidnapped. The film ends with him killing the guy she was having an affair with, and then him putting her taped up in the back of his truck and driving off.