What was "Cartas de amor traicionado"?

“Cartas de amor traicionado” is one of the short stories in the collection “Cuentos de Eva Luna” by Isabel Allende. The English translation of the story is entitled “Letters of a Love Betrayed.”

In the story, the orphan Anilía has spent seven years at a convent in the foothills of the Andes. Anilía's uncle wants to take her only possession, a piece of land. The uncle's son Luis sends love letters to Anilía that persuade her to marry him. Luis turns out to be a violent man, and Anilía goes mad. After Luis dies, though, Anilía discovers that the letters were written by her son's schoolteacher, with whom she falls in love.