To be loved in halves

This person is the reasons i move on. This person do have good PR and she tight me up as 'partner' but introduce me as her friend. after fall to her,i know the story of her life. The story of the ex gf that have to marry with a guy. My partner still fall to her and always keep in touch with the ex ex. She said she like me,need and dont want i go away from her life,but i cant replace her ex. She said she try hard for our relationship but seem she still stuck with the ex.she move in to my house. What should i do and react after she try to avoid talking about our story