I have this friend and after making a few new friends, I realize that this friendship was completely one sided. I always tried to be patient as this friend was rlly stupid in school. Whenever I have problems and need to vent, this friend just dismisses it as if her problems are way bigger. She was never there for me and I see it now. She has depression and anxiety and I feel she might hurt herself again if I leave her as I'm the only one who can calm her down. Help