You loved Eren, you were a childhood friend of Eren, Armin, and Mikasa, but Mikasa loved Eren too, and this is where the problem occurred

You were in the Ramsey family tent when Eren went outside and you were going to follow him but Mikasa preceded you, so you listened behind the tree to see what they were talking about

And you heard Eren ask Mikasa, "What do I mean to you, Mikasa?" Mikasa was silent for a while and said, “You're... you're-”