Tree - thinking of you. Detaching is key, and the sooner you can do it the less 'damage' you will do to your relationship. Just concentrate on you, and let her do her own thing over in the corner, but dont let if affect you.
I agree with you, it sounds like she is trying to push you into making a decision to leave so you are the 'baddy' in the situation. Detach so that this doesn't happen.
Try and accept any decision she makes. If she decides that she wants to go off this weekend and date other men and be totally irresponsible, accept that she is doing the best she can, and she is allowed to make that decision. I often think that WAS try and push the buttons of the LBS, but to not show any reaction to their bad behavior is the best way of remaining in control, and therefore being attractive.
SO HARD!! I know! I promise it gets better from here. You will be OK even if the worst thing you can imagine happens, you will survive and be stronger for it.