This was a stalker thriller from the 80’s or possibly early 90’s. WPIX in NY used to air it. A young married woman is on a road trip and has an affair with a drifter. Her husband, whose name is Arthur, is having her followed by a private investigator. When she returns home, the drifter won’t leave her alone, and she is trying to break it off with him. The woman works in an office, and her boss ids an African American man. She is also being mysteriously stalked as well. It turns out that she is being stalked by the private investigator. The private investigator also killed her husband. The private investigator torments her and says, “I’m the most dangerous man you have ever met.” Then, the drifter breaks in and violently kills the private investigator.