Many people think that Armin likes Annie because he looks at her and talks to her, but that response is wrong. It's true that Armin said that he missed Annie, but he never said that he liked Annie. what actually happened was that he loved a woman who had always been alone, never even showed herself and that woman was you.

right after the plane took off, Armin sat there, he looked at you, "why are her eyes puffy?" He asked himself.

"Are you okay? Or... are you feeling jealous?" Armin asked that randomly, but he knows the answer is yes.