why coulnt lillian jean tell anyone what cassie had done to her

Cassie befriends Lillian Jean. She acts as her slave and earns Lillian’s trust. Lillian confides all her secrets to Cassie. Then one day Cassie beats up Lillian Jean, and forces her to apologise for everything she had done. When Lillian Jean threatens to tell on her, Cassie reminds her of all the secrets she had shared. Lillian Jean cannot tell on Cassie or she will spread all of her secrets.