Disclaimer: Castle isn't mine, neither are any of the characters.
Author's Note: I don't like the way that characters in the show have been reacting to Beckett's actions towards Castle. I personally believe that people should have been more angry at her, so this is my version of Alexis' confrontation with Kate.
The door to Kate's office flung open, startling the captain. "Alexis!? What are you doing here? Are you okay?" she asked her step-daughter.
"How dare you!" Alexis yelled. "How dare you stand there and ask if I'm okay! You… you awful person!" she yelled again.
"Alexis," Kate said calmly, "if this is about your father, I can explain".
"No! I don't want to hear your excuses! You lied! You told him always, and less than a year into your marriage, you leave him! I hate you," Alexis screamed.
"Alexis, please lower your voice".
"Why? You don't want people to know that you left your husband? You don't want people to know that you ripped his heart out, then crushed it? You don't want people to know that you're a monster?" she shrieked.
"'I'm not a monster, Alexis. Please, if you just…" Kate started.
Alexis interrupted the captain, "You are a monster! And you know what, you're his worst ex-wife, and that is saying something because my mom cheated on him before she left him. But you… you had him love you with his entire being, you had him completely happy for once in his life, and you killed it! You killed him!"
"Alexis, I love your dad; that's why I have to do this".
"Whatever it is, you obviously don't love him enough. Here," Alexis ripped her jade coloured necklace off, "take your stupid necklace, and your lies, and make sure that you never see any of us again". By this time, both ladies had tears in their eyes. Kate looked down at the necklace that she had given the girl at Christmas, now thrown carelessly on her desk.
"Alexis, please," Kate sobbed, reaching for the girl, only to have her hands smacked away.
"Leave us alone, Beckett". Just before she slammed the door behind her, she turned to the face the woman, "I hate you. Leave us alone, and have a nice life lady". With that, the red head turned around and slammed the door behind her.
"I'm so sorry," Kate sobbed to the empty room. Her tears finally took over, and she collapsed in her chair, tears streaming down her face.