This... is getting far more out of hand than I know how to deal with. She claims to have a split personality disorder; I spent half the night talking to the "other" her, who has an inexplicable British accent and implied the "real" her is obsessively in love with me and is afraid to end things with her boyfriend because she'd be his first major heartbreak. She also implied she might hurt herself if I cut her out. I just... I don't even. There is the "bitch you crazy, get out of my life" approach, but in the off chance she does kill herself over me, I don't think I could handle living with that the rest of my life. Might there be some kind of legal options for me to report what she's told me and force her to go under suicide watch/psychological evaluation? I'm still processing everything that's happened tonight and don't even know where to begin looking. I'm in California if that makes a difference.
Get the fuck outta there. No more contact. If you really, really think she'll hurt herself, then call the cops.