( eren jaeger/armin arlert )
Armin was in a relationship he shouldn't have been in.
Reiner was stronger than him. Reiner manipulative. And all thanks to that manipulation, nobody ever suspected what went on behind the door of Armin and Reiner's home. Nobody suspected the beatings, the yelling, the name calling, the self conflicted harm, the abuse that Armin was subjected to. Nobody except Eren.
Eren was smart and he was determined. He was determined to pull Armin through and bring all this pain to an end.