Tom riddle

You and Tom had a fake relationship. Your ex had cheated on you and you wanted to show him that you can forget him too, he wants to show people that he can love someone. In front of everyone you have to be the perfect couple. At the Yule ball you had to go together. You wanted to go with your ex. You are dancing while you watched your ex dance with someone else
It's not worth it says Tom

You are dancing at the Yule ball