How to date a 'Split Personality' person?

Now at this point im scared because i thought she might have been joking about the split personality disorder but it was just proven to be true, looking at her with amazment i just get off her and hold her from behind again telling her "its nothing" she seems fine after that and everything seems fine for the next hour or so.. Until she gets turned on, she turns toward me and starts kissing me reaching for "areas" i ask her "dont you think its too soon weve only been dating for two weeks now." she replies with "devan i love you and i want to show it in the best way i can." at this point my face is so red i cant even explain it cx.. So i agree to it and we start taking off our clothes, she gets on top of me and starts making out with me while... Well you know anyways, them out of nowhere while were doing that she breaks down and starts balling i ask her whats wrong then she proceeds to tell me that in the past shes been raped etc,so i stop and go to put my clothes on she tells me "im sorry i couldnt pleassweet" i tell her "no im not upset about that, im upset that you would push yourself so far" she smiles at me and does one of those dive hugs knocking me back onto my bed saying "your so sweet" im blushing so much its bad so i just turn away and say "thank you" she notices me blushing and picks on me for it... Sounds cute right... Then not even five minutes later shes still naked and im partially naked, she snaps into another personaliy saying stuff like "who are you." im shocked to sayy the least... Then her other perspnality i guess assumes i was one of the people that raped her, she had a razor on her bag thst i knew nothing of, grabs it and goes for my neck,i move my hand infront of it and grsb it full on (it left my hand very bloody) i tell her to calm down as im still holding her hand getting stabbed with the razor as she moves it up and leaves a gashing wound on my hand. I go to the bathroom to get something to stop the bleeding and put it on my hand, i come back into the room and she says to me "Devan whats wrong with your hand, did you get hurt." i thought she was fucking with me so i say to her "you know dam well you did this to me" in a very loud stern voice she starts crying and saying "id never hurt you" tell me when your done with this part aswell and ill continue