I started to hate my girlfriend
What makes you hate your girlfriend?
It's hard to live with her; she is too impulsive. She constantly hurts my feelings.
If you are not feeling the same way about your girlfriend as you did before, you should sit down and talk to them about your feelings. If the relationship isn't worth saving, it's better to go out on equal terms than just one dumping the other.
Are you judging me now? You can't possibly understand how I feel about my girlfriend.
I might not know your girlfriend, but I know that you are not doing well with her. It would be good if neither of you like each other to remove yourself from the relationship rather than to continue on.