abe0 said:
...great for two weeks then suddenly shee turn sour for unexplainable reasons...
It might be a little early to tell if she is BPD... Typical MO for people with BPD is to put their absolute best foot forward to pull you in... at least for the first few weeks. It usually takes a while before the underlying crazy comes out. You would probably have to observe her for AT LEAST a month before you could say for certain it was BPD, because it could simply be a lack of interest...
What exactly do you mean by turned sour? If she just doesn't seem interested, that isn't characteristic of BPD; however, if one day out of nowhere, and for absolutely no reason she created a drama storm (e.g... saying something like you do not care about her for some totally fabricated reason, or saying that you have wronged her in some way when there is no justification for the claim), then you better watch out... People with BPD usually exit stage in a VERY DRAMATIC FASHION...typically (from my experience) screaming and cursing you in a fit of anger. There are a lot of details missing here... Did you try to talk to her? If so was the conversation remotely reasonable? Or did she seem impervious to anything you said? If she is BPD, she would probably convince herself of some absolutely illogical reason to justify the way she is acting...and then be entirely unreceptive to your attempt to be rational about the situation.
If you aren't very familiar with how BPD affects people who have it, they have no control over their emotions. One minute they can be happy as can be, then at the flip of a switch they are in a sh*t mood, feeling upset and vulnerable...when that happens they go into super defensive mode and because there is no reason for them to feel the emotion they are experiencing, they literally create the causal factor of the emotion in their head. So basically imagine the feeling you get when someone just does something that makes you feel like total sh*t... well imagine having that feeling but for no damn good reason... well that is what happens with BPD, and then their mind creates the story for why they feel that way... usually by embellishing something you have done, or totally creating something. For example... you make eye contact with a waitress at Applebees... in her head she spins it into "you must be fvcking that waitress or trying to..." something to that effect.
If it is BPD, she probably will come back regardless of what you do or do not do. I would almost guarantee it. If it is the case that she is BPD, good luck dude...