Am i just over reacting?

My girlfriend told me today that she has come to the realization that she still cares for her ex boyfriend even though he lied to her, physically abused her, and cheated on her. I then have 3 questions. Is this normal considering it was her first love and her first everything was with this boy? Is there anything i can say to her or do to help her forget about him and make her focus more on me? and finally is our relationship in jeopardy?