your Mattheo sister and during the holidays he came to see you at your parents' house with his friends (the slytherin boys)

Mattheo: "i know you i know you better then anyone this isn't you!"

You: "Idk"

Mattheo: "wath your doing? Living at our parents place? Joining the Death Eather? No emotions. Why did you leave Hogwarts!"

You: "it's complicated"

Mattheo: "it's not! it's not complicated!"

You: "you don't know!"

Mattheo: "this isn't you! This. You joined the death eather."