My Possessive Dude (Working Name)

What happens when Ella gets dumped called a loser and a pushover? She cries her eyes out all night of course and is late for class the next day. What happens when when the new and smoking hot substitute teacher gives her detention and she blows a gasket on him? In front of the whole class by the way? I Would say the last two months of Ellas high school life is going to be turned upside down as this possessive dude enters her life!