How to date a 'Split Personality' person?

Ive dated a girl with 7 different personalitys.... It does a toll on your mental state, apparently 3 of her personalities loved me and the other 4 werent fond of me, she stabbed me twice through out relationship.. Its not wise to go after these type of people, im just saying from my experience with it though ^.^

Yeah she was pretty scary even though im like 6'1 and she was like 4'9 i still was terrified by her because everytime i let my guard down she tried to hurt me q.q

Okay so its gonna be very long expect that.. And here we go:i first meet her through facebook we talk and get together, our first date (of her choice.) was to meet at the cemetery so i agree and we meet there, at first we get along swimmingly for the first date, at the end of the date i end up walking her home and giving her a kiss on the cheek before i leave. The next time we hang out she comes over to my house telling me her mom beat her and that she needed somewhere to stay being the guy that i am, i tell her she can stay at my house (at this point i had no clue she had split personalities) we end up walking around and talking for awhile... Then she turns to me and says "devan i need to tell you something,i have a split personality disorder" my response was "that doesnt matter"with a smile on my face.. Little did i know i wouldnt be smiling by the end of the night,we come back to my house and we start watching a show together while im cuddling her from behind, she asks to use the bathroom and obviously i let her... She comes back with this really weird look on her face so i go up to her and ask her whats wrong before we lay back down she tell me its nothing (at thie point she has her hands behind her back.) i think nothing of it and go to lay down when i lay down she starts coming closer to me and i obviously being the dimwitted boy i am still think nothing of it... Until she reveals whats behind her back and immediately trys to stab me thankfully i have good reflexs and i dodge her attempt to i believe kill me, i rip the knife out of her hand throw her on the bed and get on top of her saying "why the fuck would you do that" she just smiles at me and says "what are you talking about" as if she never did anything of the sort. Tell me when your done reading this part and ill continue with my story