Me too! Ten years (ish), although the circumstances were/are different. The relationship was brief, but still I fell HARD. He basically pulled a fade on me and broke my heart -- I had been with my xH for 25 years so I didn't realize how this dating thing worked anymore. We did, however, meet up for lunch maybe a year later and the connection was gone. To this day I miss the conversations we used to have, and his unique viewpoint on the world and social issues, politics, history, etc.
I had hoped to have the sort of post-relationship relationship with him where we could get together once a year or so to catch up, but I guess he didn't want that with me. My life (and my self as a whole) has changed SO much in that time, and I have reason to believe his has too. But I'm not sure how I would reach out without it looking like I'm sniffing around. Which I'm not, I'm very happily involved with someone else. He did call me a maybe a year or so after I last saw him but I was on a date and I let the call go to VM, which he didn't leave. I never called him back, and that was it.
Mostly I'd just like to show him that I moved on from him just fine. 🙂