Margaery Tyrell became the queen in this realm and universe, took the Iron Throne and unite the Seven Kingdoms under her heel and power. She did kill Cercei, won over Daenerys, took all her dragons from her and kept them. She is now only one dragon princess and queen. She put the North on its knees and make herself queen, first not Stark royal and queen in their history ever. You are just a prince from some small, distant, not important kingdom, she did marry because of politics benefits. You are just a small boy, a kid in her eyes, almost toddler. In this marriage she took as the dowry from you your not so big army, jewelry and another wealth, she put her strong hand on. She is cold, arrogant, ignorant, mocking against you and look down on you. She never will make a divorce, your destiny is to live forever in her shadow, under her thumb and high heel. Often she orders to her ladies-in-waiting and maids of honour to take you to look after you, because she is too busy in her royal duties. Your opinion and words mean nothing in her world and country, where she rules with iron fist.