I would bet money she did indeed know about you dating someone else. Look at the timing: you date someone else, she wants you back, you stop dating someone else, she doesn't know if she wants to reconcile. Trust us, she does notice your changes but she won't say anything for quite some time.
Follow sandi and R2C's advice: do what works. Taking care of yourself, moving on with your life, dating other people will be good for you and will make her rethink what she's doing. I understand if you don't want to hurt someone else in this process so either keep the dating casual or just go out and be around other women in a platonic way (a la R2C).
If you love somebody, set them free. http://tinyurl.com/2empx2g