Stefan interrupted her and agreed to her words. He had been waiting to fire her as well and since she suggested it, he had no qualms about it.
Cayenne stiffened and was surprised to hear him agreed with his words. Knowing that she's got no other option, specially that she couldn't take back her words, she stood up and wiped her tears. Her heart was heavy but she was the one who suggested the separation. She couldn't just blame him. She hated herself that she developed some unwarranted feelings. She hated herself that she was not being careful around him. She hated herself that her heart chose to love him. However, she just couldn't regret her choice. Even though she was hurting around him, she was also the happiest when she's with him and got his attention and care.