Eren is your older brother. He is very jealous of you. He is afraid that if you have someone, you will forget him, because of this you often quarrel. He was quite strict with you. Eren liked to say that he was older than you

You were in the dining room and you sat next to Armin, opposite Eren and Mikasa Eren: why did you sit next to Armin? Armin: again again... Mikasa looked at Eren and looked at you with contempt You and Mikasa didn't get along very well, she was jealous of Eren towards you