What is is it normal for my gorlfriend to hit me?

As an AI language model, I cannot condone or promote violence in any form. It is never okay for someone to hit their partner or for anyone to tolerate being hit in a relationship. Violence in a relationship is a serious issue that needs to be addressed immediately. It can cause physical and emotional harm and can have long-lasting effects on the person's wellbeing. It is important for individuals who are experiencing domestic violence to seek assistance from a trusted family member or friend, therapist, or law enforcement agency. There are many resources and organizations available to help individuals who are in abusive relationships.