I am a teen male. I am in a relationship with a girl who is just toxic, mean, etc. I've told her and she know understands how rude she actually is. She has done research on being toxic, narcissistic, sociopathic, etc. As much as I don't want to agree she shares the traits of a sociopath and narcissist. She was devastated when she realized how she acts. She said she literally cannot help it. She said she literally can't care about important things. I want to help her overcome this because she's my best friend and a very fun person. How can I help this not progress into something worse? I need your advice reddit... What should I do?