Love Changed To Frustration and hatred

I Loved Her So Much, And at the beginning she used to treat me like something that will end really soon, I kept fighting for her and I thought she might appreciate this one day, But she didnt, Now She is a TERRIBLE PERSON shes angry all the time and she treats me badly, beside that she never remembers anything I tell her to do, and shes a terrible girl friend...I HATE HER! I'm just in this stupid relationship cause I feel Karma is slapping me back, the consequences of leaving will be endless drama, And because we slept together!