Should you dump a girl if she can't seem to let go of her past relationships?
I'd suggest having a heart-to-heart and telling her that you
find her attitude very hurtful. It's possible that she's confused
about her love life, as many people are at some time or other.
However, you have first-hand knowledge of the people concerned and
I don't ... first i'd say you talk to her, and not just dump her.
let her know what you want to do and why. if she say'd she'll try,
then gve her another chance. if she just can't seem to let it go,
then it is time to let her go, and move on.