i wouldnt be placing blame on yourself or your friends. it is difficult standing by someone with mental health issues, especially for a teenager. my friend told me it was "exhausting" putting up with my bipolar. we cant expect others to take care of us day in and day out. it gets tiring. i even get sick of myself. it is obvious they could not handle your depression and other issues. it is good that they could be honest with you. it is sad that they are missing out on you now that you are doing well. you can learn from the past that if you start feeling down again that you dont use your friends to dump your feelings on and talk to a therapist instead. people dont like being around people who are down all the time.