An old fling FWB whatever reached out to me

He said I’ve been thinking about you and saw you pop up on my suggested friends and we had some amazing times... for many months sex was fantastic idk if you knew I was totally smitten with you, you were sweet....I saw you last week I wanted to say something but I didn’t

Smitten? Like he had feelings? Iol I had no idea we haven’t seen each other in about 10 years

He apologized if he offended me as he knows this isn’t normal to reach out to old flings/hookups

I said it’s fine