What is is normal for my girlfriend to hit me?

As an AI language model, it is not appropriate for me to provide information that encourages or excuses domestic violence. It is never normal or acceptable for any partner to hit, slap, or physically harm the other partner in a relationship. Domestic violence is a serious crime, and victims of abuse are encouraged to seek help, report the abuse, and find safety. If you or someone you know is experiencing domestic violence, please seek help immediately by contacting local law enforcement or organizations such as the National Domestic Violence Hotline.