Anthony

verb /ˈæn.θə.ni/

The act of committing to an outing or event, subsequently flaking out, and then attempting to gaslight others by denying any agreement or commitment was ever made.
A maneuver in social settings where someone backs out of plans and then manipulates the narrative to make it seem like their attendance was never confirmed.

"I can't believe he pulled an Anthony on us again, claiming he never agreed to come to the party when he was the one who suggested the date!"