Sad over an ex-friend?

sometimes I have lost friends due to my behavior, and also from being so depressed- I would let them go. it is hard to be around someone who is depressed, just as it is hard sometimes with other illnesses people don't understand. Sometimes I have found people aren't always around forever and not for anything you did or they did, it's just a "season" they are in your life, fulfilling whatever need it is at the time. I understand the lonliness, my depression makes me turn people down, its a terrible cycle, and as we get better we find a different meaning towards friendship, a healthier vision of what it truly means. As to her using you for comfort, its not right and she wasnt a friend to begin with. Espeicailly if you werent in the right condition to help her anyways.