She isn't worth more than being friends and i guarantee that if you date another girl, she will question/ talk about her until she has a man in her life. The users.
At first glance, you might think the reason your ex keeps coming back to you after his This will never work out for someone, as the most important lesson you will now that he or she feels like committing again, they're back on your doorstep.
Neither do I know, nor does it matter, what she is up to! The thing to be focused upon here, is that you can't allow her to hurt you even more. Listen pal!