decathect

decathect \dee-kuh-THEKT\, verb:

To withdraw one's feelings of attachment from (a person, idea, or object), as in anticipation of a future loss: He decathected from her in order to cope with her impending death.

Freud argued that grieving involved a process of remembering and reflecting upon all the memories associated with the deceased in order to sever an emotional connection, or "decathect," and make room for new bonds and relationships.
-- Maria Cizmic, Performing Pain

Jonathan was the name of the boy in the pagoda with Michael. "He will continue manipulating Jonathan. We must get Jonathan to decathect from Michael."
-- Chaim Potok, The Promise

Decathect originates from a combination of the Latin prefix de- implying an undoing or removal, and the Greek term kathek meaning "to keep, hold on to." It was originally used by Freud in the 1930s.