Texting:
Basically, she has been giving out a lot of mixed signals and I don't even know what to think anymore. On another note, my text game is not top notch and I've been having an hard time trying to frame the conversation.
Actual conversation:
... Doing small talk... (Everytime she asked something about me and I didn't answer, she kept asking. She was basically leading the interaction. At one point, I tell her that I would like to invite her to X place)
Her: Would be cool but sorry, for the moment I got a boyfriend

Me: Pfft, look at you, already thinking that I'm trying to seduce you, your unbelievable!
Her: Oh ok good to know, so you talk like this to all the girls you meet? Even to my friend X?
Me: Maybe your cute, but I need more in order to be attracted to someone!
Her: I could say the same about you, but I have a boyfriend so I wont... But if you know you can get someone better than me, talk to me in a way that it won't be weird, especially since you know I have a boyfriend! :O
(Really mindfucked me, didn't know what to think)
Me: You just said I was cute btw

Her: Yeah and??? like you said there's alot of cute people out there, your not the first I see :0
(Small talk... At one point I tell her I could basically talk to her a bit and know her better than most of her friends)
Her: First of all I don't have anything to prove to you, blah blah... Been with older guy than you (I was teasing her about her age), including one of them who I really loved and who passed away, and now I'm with a boyfriend that I love. I like to dance, read, etc... I'm a blah blah blah girl so don't try to read me, I already told you everything about me. And I really hate when someone try to play with me like you are doing right now!
(Really. Really, destroyed my frame. Woah... ok? At that point, I know I had to show a bit of my good side so I started talking a bit nicer, ended up doing the cube routine on her via phone for the first time and it ended up working perfectly. She was "petrified" how accurate it was. Since then, she's been nicer to me, but when she is always curious about why I want to see her again, what makes her different from her friend (I actually told her that, and she's been asking me why like 5 different times over the past 4 days...)
How do you guys deal with girls like her that are really unpredictable and give out a lot of mixed signals... At that point I'm not even sure if should just wait until she is single and invite her somewhere or try to fuck her while she is still with her boyfriend. Ugh.... Psychology....
(Side note, she is really really cute, If I managed to sleep with her, I would probably want to see her again)