Once... , my close friend showed me a guy, that was in his cousins band, he was cute but like I didn't think much of it. Little did I know my close friend was having chats and had showed pics of me to him which I found out after we started dating...
Anyway worked out okay we had a kid together and a 8 year relationship xD, my close friend prides himself on hooking us up although it wouldn't have happened if I weren't the straight forward person I am and didn't start talking to him first lol
As for the guy, he may have good intentions and may think you just seem lonely really.. Who knows when in doubt ask?