"After your first Games, I thought the whole romance was an act on your part. We all expected you’d continue that strategy. But it wasn’t until Peeta hit the force field and nearly died that I —” Finnick hesitates “That you what?” "That I knew I’d misjudged you. That you do love him. I’m not saying in what way. Maybe you don’t know yourself. But anyone paying attention could see how much you care about him," he says gently. - Mockingjay, Chapter 11
Let's take a moment to appreciate the attention to detail. Thank goodness for Francis Lawrence!