Not quite sure what happened to you Winter Moon but I am going to go by your title of this thread. I too have lost a few friends online, I was deeply hurt. One friend in particular, she and I would talk for hours a day via email and message boards. We were friends for almost a year. We were so close that we sent care packages to each others home. Then we had an argument. She did not want to patch things up. I was crushed, I cried and cried. I used to call her my "best online friend".
I am not sure if you are talking about someone online or not but know that if you want to talk I am here for you.