You learn more about Livvy as time goes on. She was only with Rebeus a few times at the beginning before she got involved with the MC. The other times she ONLY engaged with the women. The brother is an utter asshole who is focused on destroying his brother. Charlie tries to avoid Rebeus but Rebeus uses his authority to push her in to a dinner. Charlie isn't infatuated, she is just at that time in her life where she is curious about things and wonders what all the fuss is about. She never had any intentions of being with Rebeus.