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The Freys are not The Starscream because this is a trope about The Dragon betraying the Big Bad, subtrope of Evil vs. Evil etc. It's safe to say the ones betrayed don't qualify.
I'm not sure what trope applies, Et Tu, Brute? sounds more centered in the betrayed than in the betrayer and doesn't fully fit, but it may do for the time being with some rewritting.
I agree The Starscream doesn't fit since the Starks are certainly not villains. Et Tu, Brute? should work for now
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