Since the day Eren saw you, he's felt an undeniable urge to protect you. Freedom was what he strived for, so it should be wrong for him to deny it from you. Yet he can't help but want to keep you away from the world outside the walls.

Looking at himself in the mirror, Eren begins tying his hair into his signature bun until he notices you in the corner of his eye

"Why are you here? I thought I told you to stay in your cell below. I've told you already that it's too dangerous to leave."