I saw this movie on TV around 2000, so it was in the 1990s or possibly 1980s. A man is breaking up with his wife and clearly does not want it to end. He goes on a road trip and gets terrorized by another man. I can’t remember if the man doing the terrorizing was having an affair with the wife or if she hired him to kill her husband. I think she hired him. At the end he gets even with his wife.