complicated feelings

A normal girl starts attending a new and daunting private school. Going into her first class, she recognises someone straight away. But it couldn't be him could it? A million thoughts running through her mind. What was he doing here? Why did there have to be someone who she had history with here? Did he remember what happened?
How do you confront someone about something that you're not even sure they remember? And if they do remember, how do you stop them from telling the world??