[ He does know she can't lie, which is why he cleverly asked her! And he listens to every word, relating some of the things she says to the things he's come to know in Remnant. Racial differences, suicide missions, revenge... ]

Oona... I don't want you to die... [ But he understands that neither of them can stop that from happening if they ever restore the status quo. He's going through a similar dilemma with his partner lately. ]

Maybe... maybe we'll find a way to fix everything-- a way to keep our memories, or... or change things in our worlds. A way to undo all that misery...

[ Wouldn't that be nice. ]