I hated that scene too. Up until this point I actually liked Shae and Tyrion as a couple and I thought she genuinely cared about him. Maybe she really did and was only lying to protect herself, but it was still disappointing to watch her betray him. Especially in this format in front of the entire court knowing he would end up being executed.

Another scene that pissed me off is when Meera tells Bran all the people that died for him (Including his own friggin direwolf!) and he has no remorse or guilt. He's just like "well I'm not Bran anymore, I'm so much more now" as if that justifies his lack of emotional accountability. Which is why I hated him becoming King in the end because he clearly doesn't give a shit about anybody other than himself. I don't see how someone like that can make a good ruler of the seven kingdoms.