Why Women Struggle With NEXTING a Relationship

Why do women have such a hard time moving on from a man and a relationship that they KNOW is no good for them? Women will tend to hang on and on, trying in vain to stir the heart of a man that is not interested in them "like that." Women will also waste a lot of time and energy trying to change a loser into the dynamic man they imagine he can be. Women give their beloved men chance after chance, enduring lying and mistreatment time after time. Why do women continue to love and stay with men in spite of the fact that he isn't the one and ain't trying to be? Why wouldn't these women prefer being single to being miserable in a relationship? Is it really true that having ANYONE is better than having no one at all?