He finally looks up at her face and doesn't like what he sees. She seems like she's closing herself up all over again. He keeps saying the wrong things over and over and he doesn't know how to fix it. Their wires keep getting crossed. He just wants her to stay, or be able to leave with her, but it's selfish of him.

"Do you? I don't even know if I do." He's trying, ok! Cassian has always avoided analyzing his own feelings. It made the job easier. But Jyn isn't just the job anymore. "I don't want to keep hurting you."