Be patient and keep trying to be friends. I once had a sorta friend that lived upstairs. We would have great conversations, but when we passed - she often didn't acknowledge me, I would just sort of shrug it off. We became very good friends, and discussed it a few years later. She didn't wear her contacts most of the time, and therefore was never sure if it was me or not. We laughed so over that, and I always drove after I found out she was blind.
