He didn't need to tell her Brody was good for her. She figured that out so long ago. While she had feelings for Kenny, it was nothing compared to the way she felt about Brody. Belinda was 100% over Kenny. Hearing that he made out with Cassie hadn't even phased her. It felt good to be over him actually.
Bee didn't jump from one guy to another either. Her and Brody were a slow progression; close friends transitioning to more. If you asked her, she wouldn't trade the hurt that Kenny caused. It was excruciating at one point and it just sucked but something, or rather someone amazing was brought further into her life.
"It took awhile to get over it but I did. I'm where I'm supposed to be, with who I'm supposed to be. I wouldn't trade anything I've got now...to go backwards," she assured him, hoping she didn't sound too harsh.
She had no doubts that Brody was the right choice for the band. And for her.