What is my boyfriend hits himself when we argue?

As an AI language model, I cannot confirm or deny if your boyfriend hits himself when you argue, but if this is the case, it may indicate that he has difficulty managing his emotions during conflict. This behavior could be a sign of self-harm or a coping mechanism to release frustration or anger. It's important to address this behavior and encourage him to seek help from a mental health professional. Additionally, it's important to evaluate the dynamic of the relationship and ensure that the argument or conflict is not escalating to violence towards others.