Who is the most unexpected person you got ghosted by and why?

I met a guy. We had a lot in common. He seemed to be a super genuin person. After 4th date, he just ghosted me. No single clue what happened. He seemed to be genuin, so I wonder. Also, I got ghosted by a person who was texting me for 3 years. 3 years and suddenly he is ghosting me. Explain yourself.