Hmm, I personally don't think you should stay with her if you don't feel comfortable anymore. From my experience, people change, and it lasts for a couple of weeks, max a couple of months... and then it's as if they didn't change at all. At the same time, I don't think someone should change for the sake of a relationship, but that's beside the point. Plus if you've already given her a chance before, and you really don't feel like she deserves another one... and yeah, she was obviously gonna realize now that you said you want to take a break. I guess talking to her could be a good idea too.