Ever since I left university/academics and got a job in the 'real' world, my circle of friends has withered away.
It's not that my friends don't like me or something, it's just that we all moved away to different cities and countries, and emails and phone calls are not the same as meeting in person. I get along well enough with my colleagues, but since I see them all day long, I don't really want to see them in the evenings and weekends too!