At any other time her weak response would have bothered him, but not now. The whole point of this was to detach himself from her, and that meant ceasing to care what she thought of him. Bran knew he was far from perfect, and he'd given Lotte absolutely no reason to trust him despite the numerous chances she'd given him. He didn't want or expect her forgiveness or even her blessing, because he realized now that he didn't need it; he just wanted to let her know that it was over. Whether she believed him or not was beside the point.
He listened as she said she hated dancing, the words ringing a familiar chord that was lost when he said she was going to try again. She didn't need to explicitly state what she was going to try again... but she didn't need to. He already knew, and he was glad that she was going to give singing another chance. "I'm glad that you're going to try," he said honestly. "And I hope it works out for you."
Bran cast an unconscious glance over his shoulder, although since there were so many people around it was impossible to tell if he was looking at anything specific. He just needed to say what he wanted to and leave - this didn't need to be dragged out or prolonged. "I know you don't trust anything I say, and really, I don't care. I'm not saying this to convince you or... guilt you into forgiving me. This isn't about any of that." He paused, keeping his gaze forward instead of looking away. "I told you once that I was looking for something, and that's why I came here - but I didn't know what it was. For a while, Lotte, I thought it was you. After I heard you sing..." He trailed off with a sigh. "But I was wrong. I wanted you to sing again because your voice was too valuable to be put to waste, but even if you had started singing again it wouldn't have made a difference. I was looking for a purpose, something to make life worth it - because my music wasn't quite enough." He paused, glancing upwards almost thoughtfully. "I think, in the end, I did find what I was looking for. Which is why I'm not doing what I did before - moving from place to place like some kind of shadow." Gathering together what was left of his willpower, he finally reached his point. "I am sorry for what I put you through, but that doesn't change anything. The point is that I'm never going to see you again, and honestly? I'm fine with that." He wasn't being cruel, just honest. "And whether you believe it or not doesn't matter - I just needed to say it."
He waited a few moments before breaking the silence, feeling oddly lighter. "Anyway. That's... it, I guess. Other than goodbye."