Am I Being Unreasonable? Original Owner Wants Car Back

Never let emotions be a factor in a car deal of any kind. I had a '72 Demon 340 4-spd project car once. And one of my friends beat on me that it was the perfect car for a father/son project, on and on and on and just had to have it. So I sold it to him for considerably less than what it was worth. Six months later I find out he sold it to another for over 20 times what I sold it to him for. I've never forgotten that life lesson.