We reflect on certain object-relations in addiction-related problems in which the loss of object is not processed. When the introjection of the object — which is expected to be sufficiently satisfactory, and which the subject is expected to identify with — fails, his/her withdrawal (as well as the toxic) appears to be impossible. Drawing on the notion of nostalgia developed in Freudian, Kleinian and contemporary psychoanalytic studies, we have developed the concept of anti-nostalgia. We define this as a process through which the compensation of identity gaps and substitution occur through the idealization of the object. We posit that the addicted subject cannot invest nostalgia, sorrow and regret in the object. On the contrary, via idealization, i.e., the repression of representations that generate nostalgia, the subject seeks to isolate associated affects. While nostalgia helps set the stage for the dis-idealization of the object and of the perception of its loss, idealization in anti-nostalgia may make it possible to block out all ambivalence and, in so doing, mitigate all aggressive movements by avoiding all possible conflicts and guilt about the object. The last part of the article will focus on the effects of the anti-nostalgia process in treatment.