Ein was your enemy

Your boyfriend had forced you to go to a party. Yet he spent the whole time with his friends and drinking. That was until his ex gf approached bf/n and they kissed

He had told you he was over her. What a lie. Then you went to an upstairs bedroom upset. Then ein had come in and seen you

"Who did it?" "No one" "I can see it on your damn face. Who. Hurt. You?" so you told him. He immediately went to find your bf and you followed. He punched your bf straight in the face