You cast aside friends to stand by those with knives to your back
Obsessed with two, that’s you, a broken Gemini -> Broken Gemini could be gender reference, as Gemini is often considered a 'masculine' star sign (wikipedia~), broken gemini, gender reference for female.
You follow laws without wavering, but you broke the cardinal rule -> History reference, she believes in peace yet started a war.
You dabble in blood but play in shadow- how crude -> Often referred to as 'little shadow mare', has bloody past.