Have you ever had a friend disappear without saying good bye?

I had a very close friend online and by phone. We were realllllly close. We talked every day and emailed and messaged constantly. And then one day she was gone. And I have no idea why. I mean she is still around but she stopped writing, stopped coming around our circle of friends, stopped everything. I don't think she is mad since I did nothing to make her mad. I guess she found new friends or something. I know I could write and ask what's going on but I am stubborn. Obviously she doesn't want to talk to me and I don't beg people to be my friend. But how weird considering we discussed once about not disappearing on each other like so many net/phone friends do. Then she went and did it.

Yes, this has happened to me & it hurts a lot every time. I get attached to people pretty quickly & it's very painful for me to lose a friend.