She probably still likes him a bit. Don't take it as shes going to go back to him, but maybe you should talk to her about it. If she sees you care it'll just be another step to her pulling away from her ex.
Answer mine please?
http://answers.yahoo.com/question/index;_ylt=Agf6dYQGlWYDGJCgujrDDiwM_dw4;_ylv=3?qid=20111008181807AASZXAe