I think it depends on the guy. It's not totally related to the situation you asked about since we never dated but there was this one guy in our circle of friends that asked me out a couple of years ago, but I didn't feel anything for him and I said no.
Afterwards we were still friends but when I got a boyfriend he was soooo awkward with him, always asking him rude questions to belittle him. The friendship wasn't strong to start with and I decided we were better off if we end this friendship, by sorta drifting away.