Explain how the author uses an ironic twist to create a surprise at the end of was it a dream

The author uses an ironic twist to show that people are never as they seem and that the truth will one day unveil itself someday even if it is after death. The reason why the ending cane as a surprise is because the narrator described their lover as someone honest and had nothing to hide, but in the end we find out that she was dishonest and because she went out to meet her second lover she died.

Explanation:

I don't know if this helps you guys but I tried my best to get it right.

d. because santiago thought any sharks would assume the marlin was part of the boat