She's taken, so at first she declined your invitation and explicitly told u that she is taken. Then u insisted and "texted her some flirty/sexual things", and she liked it so she decided she could cheat on her bf with u after all. So basically her behavior has nothing to do with wanting to get a drink instead of going to a restaurant. She's a cheater and probably a slut, thats all.
All these machinations in order to have sex with someone who said they were taken? No single women in your vicinity?
it seems obvious to me alcohol clouds insecurities obviously she isn't terribly shy she has a boyfriend however - she wants to lose her inhibitions thus she is looking to establish intimacy quickly through relationships and the likes she wants to have sex and nothing more.
She either broke up with the boyfriend, or she wants to be your friend... Or doesn't care about the boyfriend anymore. Some girls do enjoy platonic male friends though, so you never know what she's thinking. I say go for it in a respectful way... if she mentions her bf one more time, you need to fuck off. Also, I don't like the sounds of you getting a girl drunk to bang her. You kind of sound like a douche... Maybe thats why she didn't want to have dinner.
There's another alternative. She wants to mess around. She just wants you to know it's just messing around, and she's a little bit ashamed of it. She wants it to be *your* fault later. Maybe consciously, maybe subconsciously.
Three possibilities: 1.She is slut, get fuck when alcohol involved usually, so Ok for drink but not for dinner. 2. She was interested in you, but actually seeing someone else, so can not decided to go with you (dinner), eventually made up her mind to go with you later on (drink), so there are not dinner or drink issue. 3. You might be a random back-up, she was in trouble with BF, so got u in bar, later rejected you cos made up with BF, accept u for drink when trouble came again.
i hear two contradictory facts; one that she does not care about her boyfriend with the fact that she denied your first proposal due to having a boyfriend; the one things contradicts the other; so "I am having a boyfriend" is an excuse because if that was the real case then she would not come for drinks with you anyway and she would not also respond to your text messages... my guess is that she did not like you far enough the first time around to give you a shot, the second time though she might be bored, have nothing to do or has a bad week with her boyfriend (which she does not overestimate in general) so she said; "okay so what am i to lose?" It is also possible that she had in mind another guy and that did not go that well with him so she is turning to another alternative (you to have fun). Whatever it is do not bother with that as it seems to be trivial, since she accepted you have chances, she likes alcohol, you know it, so give her what she likes and perhaps she will give you what you like if you keep dating her. Persistence seems to work with her...
Here is a scenario: the chick is an out of control alcoholic who will fuck anything, but can't keep a relationship happening for more than five minutes as she is too messed up. You will fuck her and catch a disease, and one day when you are out, one of her many conquests will spot you and stab you as he thought you stole her from him when she took off after some other dude.
Have you ever tried? I have some friends they shag woman in the bar toilet, I love having sex in special place but was too coward to do that, now wanna give it a try