The dominant train of thought when it comes to courtship and relationship behavior is to look at these from a psychological point of view. Innovative researchers like Dr. Helen Fisher and Karl Grammer provided an alternate viewpoint by studying courtship and relationship behavior from a physiological point of view.
Psychology versus physiology.
Compared with the psychological p.o.v on courtship and relationships, the physiological p.o.v. is relatively new with lesser volume of studies.
Here's a brief background on how oxytocin affects courtship and relationship behaviors from the US National Library of Medicine:
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC1621060/
Quote:
It is interesting to note that oxytocin seems to be released during sexual intercourse and orgasm and during the application of different relaxation techniques, so that it is thought to be one of the promoters of attachment and/or mediators in the decrease of the stress responses which are related to positive social bonding.
This is basically pioneering science that we're trying to apply in PUA techniques versus using the traditional psychology perspective.
The idea in simple PUA terms is that when a girl is causing too much drama, she might be craving for a good fuck. This is not surprising since several reputable studies indicate (depending on the study) that some 70 to 80 percent of women are not having any vaginal orgasms at all in their relationships.
Solving your problem through this point of view could work or could not work. But it doesn't hurt to try something new especially when the old tricks are not working.
You might also be interested in this related study, Oxytocin Increases Trust in Humans, here:
http://www.ncbi.nlm.nih.gov/pubmed/15931222
@n2thevoid: But of course, most normal girls without any serious medical conditions crave for drama more than men do. This is the reason why erotic romance novels, gossip magazines, reality TV, soap operas, etc. sell so well around the world. If girls can't get drama vicariously, they often create drama in their relationships so they'll feel alive. How? One way is they cheat on their boyfriends and husbands. Another good example is what the OP is undergoing; been there, done that.
I'm passionate in learning why these things happen so I won't make the same mistakes again in my relationships. Hence, I study scientific theory combined with the pick up arts.

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