From the Osa Peninsula

For a second, he feels like he might give them too much attention. That's a dumb thought. He promptly shoves it away. Sweeney can feel himself--well what he was before but not before that--just below the surface, and he's searching for the cracks.

"We fucked b'fore. Well, b'fore we fucked." Obviously. He's looking for clarification, because he could have easily made the memory out of other pieces.