He's increasingly uncomfortable, but there's nothing to be done for it but carry on the conversation. There's no way she'll keep following him if he doesn't keep talking, if he tries to refuse or even steer her toward some other topic (not that that seems likely to work). And they're so close. It'll be over soon. Bodhi is a fine liar if he wants to be, but he's too unsettled to come up with anything better than the truth, and what if Jyn remembers some of this later? "I... do a lot of leaving. Pilot, remember? But, I... I guess it's usually been my call. Leaving or staying."