Feeling Depressed

I have been feeling depressed over the last few days and I have been crying more than I have for a long time. One of my best friends refuses to speak to me now because I got caught in the middle of a drama starring one of our mutual now ex friends from High School. This guy is a nutjob and he has been stalking her. He is convinced they are a couple even when she tries to tell him they aren't. I got mad and told him to leave her alone and she gets mad at me because she thinks I am partially to blame for this whole mess. I am afraid for her safety because he knows where she lives. I have been very upset because this jerk has driven a wedge in our friendship. I have cried over this and been depressed over her not even speaking to me at all. I guess I am guilty of caring too much! I am dealing with so many other things too and I just feel drained over it all.