Thanks Sarah, I have made up my mind on not sleeping with her when she's here. It will only make me feel more miserable and may be it will make it more difficult to disentangle from all the pain and emotions.
I am still curious though to know why she'd want to meet up with me, if she wishes to "move on" in her life and is getting what she wants elsewhere. Is she trying to communicate something? Is she also confused and going through a bad time but proud enough not to speak out?