Multiple times, Jyn had already fulfilled her part of the mission, in fact become a liability to it, and leaving her would have fulfilled their part of 'see you go free'. Maybe going back for her was about Kerri… Cassian wouldn't think so. It could have been a sense of fairness or gratitude or morality (Luthen would argue, his downfall in the past), but really, Cassian just needed to keep Jyn Erso alive, in the universe; ideally, with him.

He could tell she was building to something. He could no longer tell if the trading structure was helping that or hurting. He decided to go with her words. Too much I want to ask. "Me, too," he said quietly. A fresh chill went down his spine. "Like she'd been… reset?"