its interesting you say you are coming to understand what was going on.. you may be in regards to understanding your depression and being depressed but im not so sure about how u understand what went on for these 'evil' friends that left u abandoned u as u put it and perhaps mostly its because they no longer speak to you 'they ignore u like ur a leper' but think about it a lil what was it you were doing and what about them how did they feel its hard for our supports and depression knows no respect for others preferences or abilities and tolerances.. this can be read into that its not anyones fault no one is specifically to blame .. the mix was just wrong.. wrong time for the ppl involved wrong ways to sort things out wrong ways to deal with it.. but how are we to truly know these things.. most things reveal truth when its far to late to change anyway..
im sure there were better ways around it but maybe it was never going to work out.
its sad for everyone when a friendship ends
by the sounds of it its never going to be got back and so maybe talk this through in your therapy sessions in order for you to move on and get healthy and find other reasons to be alive
luck to you..