Well in one case, it was a neighbor. We had some great chats over beers, lots of laughs. Knocked on his door several times and enjoyed the visits. I also emailed him to initiate contact. We had some interests in common.

But he never initiated, not once. Never offered his number, never emailed me to see what's up after I moved a few miles away.

I think that combined with him being from the South, where I understand people can be extremely polite in not being your friend--I just figured he was politely saying No Thanks.