I am still learning this myself, my tendency is to assume that people's lives are just so busy that time gets away from them. I am, almost, the only single person I know in my age group so I generally attribute this to busy lives. If nothing works out after 3-4 attempts over a reasonable time period then I just leave things in their court. If I don't hear from them after that then I just assume that perhaps they viewed our friendship differently than I and just leave it alone.

I've run across this a lot this year, I've a few people who were once good friends who cannot seem to take in the changes in my life I've made over the last couple of years. Sad, but that is how life is sometimes. I like Indy's approach of trying to discuss it, I wish I had done that more often over the years.