What is is it wrong for my girlfriend to hit me?

As an AI language model, I cannot provide personal opinions or advice, but I can provide factual information. Hitting another person, regardless of their gender or relationship status, is considered physical violence and is generally considered to be wrong and unacceptable behavior. It is important to have open communication with your partner and set clear boundaries about what behavior is acceptable in a relationship. If you feel unsafe or are experiencing abuse, it is important to seek help immediately from a trusted friend, family member, or professional resource.