What type of irony, if any, is present in the following quot…

What type of irony, if any, is present in the following quote from “The Cask of Amontillado”? “It must be understood that neither by word nor deed had I given Fortunato cause to doubt my good will. I continued, as was my in to smile in his face, and he did not perceive that my to smile now was atthe thought of his immolation”