As unable to help herself as before, Jyn blurts out, "I'd never let him get injured, K2."

Splitting hairs there because she'd let him get hurt, she'd probably hurt him herself when she'd left -- K2 said he was unhappy and that is enough to know she did some damage even if he doesn't seem to care now past her being a flight risk -- but she would never ever let him be physically injured, even if it meant she took the injury herself.

That is just facts.