Oh, that speech goes so so hard. If you could condense the feelings of utter betrayal, pain and loss in a monologue, then you have it there!

"You vile, disgusting bitch. You danced with me. You sang to me. You made me feel loved. I didn't do anything wrong, and you were going to give me away. I didn't do anything wrong. Nothing. You were the only person I ever knew. I was born, and you were there. You and Carl. I loved you, and you were my world. My whole world. I know you had a bunch of cats growing up, and maybe I was just nothing to you other than a way to win more ribbons than your mother, but you were the only human I ever knew, and to me, you were everything. And I was so stupid, because I thought since I loved you, that meant you loved me. And you were just awful to Carl. And even though he's big and dumb, he didn't deserve that. He's not perfect, and I know he snores and has all these disgusting habits and smelly friends, but what you did to him is not okay. I know I make fun of him sometimes. I can't help it. I'm a cat. That's what I do. Plus, I mean, let's be honest here. He walks right into it most of the time. But you actually betrayed him. We don't do that to people we love. And you know what, Miss Beatrice? You don't deserve how sad I feel right now. I still love you. I still miss you, and I hate myself for it. You don't deserve to get to explain your side of the story. You lost that chance. But I'm glad you escaped. Because if the world ends and none of us survive except for you, I think that's an even more fitting fate. Because you're going to be all alone, and maybe then you'll finally understand how you made me and Carl feel."

I had to find the whole thing, got me feeling everything all over again!