This is a long story but I'll try keep it to the point,short and sweet.i met his girl called Beckie and she was great,beautiful, funny ect (you get the point) and immediately started developing feelings for her(not a lot just enough to keep me interested).anyway she invited me out once and I met up with her to chill,then she mentioned her BOYFRIEND Was on his way,at this point I dropped interest completely.when I found out who it was I didn't just roll over, I stayed for a ride.it was one of my old friends that iv known for 15 years,I'm alright with him except he got with one of my ex girlfriend's after 2 days of me dumping her(yes I dumped her but friends don't do that). Anyway, I guess a part of me wanted revenge, so I started hanging out more with Beckie and over time it got o the point we done some foreplay ect. She tells me she "loves" me yet doesn't know what she wants,I friendzoned her straight away but she somehow finds her way back into my life only to still not know what she wants.her boyfriend was beta,got too jealous,would always talk about me ect she and him always argued and they were on and off for sometime until he finally ended it with her. I move in a little more and she still says she doesn't know what she wants,I said "we're more than friends,almost like friends with benefits" to which she replies "friends with benefits don't have feelings for each other" . Just where the hell do I stand with this woman! I told her I guess were somewhere In between.she told me she's never liked anyone more than me and that she doesn't want to rush it incase something goes wrong and she loses me.its always a minefield when saying things to her.after reading this you probably just think she's a using bitch but there's a catch ..... She's bipolar! She didn't tell me up until about a week ago. Now that explains a lot. I don't want to give up though because I'm so close to getting laid.how should I go about this?

Added note: She's a model and a hairdresser in her spare time,great personality and everything it's just she's so confusing.

Another note: I have a tendency to take women off their boyfriends,I don't know why I can do this and get somewhere yet can't seem to pull any girl outside of a relationship?