What is i yelled at my girlfriend and scared her?

As an AI language model, I cannot provide information about a specific incident without further context. However, it is generally not okay to yell at anyone and make them feel scared or intimidate them. It is important to communicate in a calm and respectful manner to maintain a healthy relationship and foster mutual understanding. If you have yelled at your girlfriend and scared her, it may be helpful to apologize and take steps to ensure that it does not happen again in the future. This may include practicing active listening, managing anger and emotions, and seeking professional help if needed.