Archeologist Dante Covelli is a complicated man with a complicated past he doesn't talk about. His personal philosophy goes something like this: It's up to me to make things right. Of course, Keegan Thomas feels that's her job, so it's no surprise they don't see eye to eye.
Dante thinks Keegan is nosing around and interfering in something that is not her business by asking questions about a photograph taken on the reservation fifty years before. She, on the other hand, feels she's bringing a gift of memory to young Navajos by providing them a glimpse of the faces of elderly family members they may never have seen before.
Dante questions her true intentions as a journalist, and with good reason. He came to Monument Valley in the first place to keep a low profile and avoid contact with the media. He wonders if she's there to bring up that whole mess from his past.
He thinks Keegan is irresponsible and inconsiderate. She wants him to lighten up. He, like Keegan, tends to bury himself in his work to dull the pain of the past, a pain inflicted by people in whom they'd invested their trust.