You were in Levi's squad, Levi had a crush on you though obviously he never showed or told you but he showed through actions, still you were unaware.

You knew that Hange loved Levi, you always saw them close, levi teasing her, he was the closest to her so you thought he loved her too.

So you were trying to get them together, you thought they were perfect couple and shipped them, you always gave them alone time.