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Spoiler..
I don't understand the people saying Rohan is a traitor because he betrayed the FL. Rohan is actually stubornly loyal, even in the face of his love for the FL and Leon. He is the emperor's knight, first of all. And a knight's utmost loyalty to the one he serves is a part of his holy oath. He will not be a traitor to the FL in the future because he is not the FL's person, and the FL knows this; in fact it isn't only once where the FL thinks that Rohan's loyalty is with the emperor. He is the emperor's person, and because his main trait is his unbreakable loyalty towards the one he solely serves, we cannot really call him a traitor or say he betrayed the FL at the end of the story because ever since the beginning, his loyalty has always been with the emperor.