What does the reader learn in Chapter IV about the reason why the Witch had broken things off with Luismi?

In Chapter IV, the narrator states that before Munra quickly extricated himself from what he considered an embarrassing conversation with his stepson, Luismi told him a few details about the situation with the Witch. Luismi told Munra that his falling out with the Witch happened after the Witch unjustly accused him of stealing 2,000 pesos from her.