In the story, And of Clay Are We Created, why does the narrator want to change places with Azucena?

The narrator wants to change places with Azucena because of the things Rolf shared with her.... the things he'd never told anyone, not even the narrator.

The girl had touched a part of him that he himself had no access to, a part he had never shared with me. Rolf had wanted to console her, but it was Azucena who had given him consolation.

Rolf assured her that he loved her more than he could ever love anyone, more than he loved his mother, more than his sister, more than all the women who had slept in his arms, more than he loved me, his life companion, who would have given anything to be trapped in that well in her place, who would have exchanged her life for Azucena’s, and I watched as he leaned down to kiss her poor forehead, consumed by a sweet, sad emotion he could not name.