Tyrion and Jaime’s relationship being torn apart. In a moment of rage after Jaime reveals the truth about Tysha, Tyrion becomes spiteful, insults Jaime, tells him Cersei has been sleeping with other men, and then falsely admits to killing Joffrey. That moment in the book broke my heart because Jaime and Tyrion loved each other, and I’m not sure it can be said that anyone else truly loved Tyrion. And in a few short moments, they end up parting on the worst of terms. The show didn’t do that part of the book justice by having the two leave each other on good terms, and then opening Season 5 with Jaime telling Bronn after a slightly lighthearted moment that Tyrion killed his father, and that the next time he sees Tyrion, he’ll split him in half.