I’ve been in a similar circumstance, right down to it happening on your birthday.
Considering that she would do such a hurtful thing on your birthday, of all days, means that she really is more interested in herself than you. Regardless of how drunk or uncertain she was.
If you ever talk to her again, remain fairly neutral. Let her know she hurt you and angered you, and make it clear that unless she’s going to apologize there’s no reason for you to talk.
Then, once you have an apology, say something icy and get the hell out of there. You’ll be safe and you’ll also have an apology to help you feel better.
Don’t talk to her again, do not become friends with her, part ways knowing that you are a little wiser and perhaps now a little bit more aware of the benefits of putting your well-being above others.
I wish I had the benefit of hindsight when it was happening to me. If you want to email me privately to hear more about what happened to me, feel free to do so. I believe it might benefit you.
You said you like to step back and observe the situation, that doesn’t work in relationships. In fact, my version of your experience was the catalyst for the number one rule that safeguards my personal life: do not get hurt for someone else. Generalized, yes. Altruistic, no. Sensible, yes. If you think about it, if the person was really concerned with your well-being they wouldn’t put you in that position anyways. Would you put them in it? No. Why? Because you care for them.
She might actually care for you, but with a girl this messed up you’re going to get hurt. She cares for Bob. She cares for her urges. She might care about any number of things that directly influence how she treats you, ie. she might care about the opinion of others.
Check out http://www.layguide.com ( http://www.pickupguide.com ). One of them is a pay site, one of them is free (same content), but both of them are fascinating. Regardless of whether or not you agree with what is being presented to you, you must admit that they make a powerful case for being in control of how people treat you.
Someone treats you in a way you don’t like, get rid of them quickly and decisively. There are others. You’ve heard the quote, “If you esteem yourself too lightly, others will not esteem you at all.”
I hope it works out better than we expect.