The Knight of Cups is guided by emotions more than logic. He follows his intuition across the landscape of dreams, questing for ideals, for it is ideals that he loves, more than reality. The inverted Knight of Cups shows that he has let his emotions control him too much: he wallows in his emotions, unable to act. He may have grown disappointed in the quest he has set himself upon, the reality of the situation having intruded too much on the pretty imagining he created for himself.
Yeah, this is how I feel today.