Hi Jacket, good job on the library books message! Pilot's tips were spot on I think.
Don't worry he will never contact you again. But I get what you are feeling, I have the same kind of thoughts. "If I do NC maybe he will just forget I exist and move on" Well, it is a possibility I guess, but the chances are slim.
Also good that you are working on your 180s. Those are super important for when you are in contact so that you can show how different you are.