The narrator of the story wanted to forget the address because the belongings of her mother, which were kept at that address, had lost all their emotional value for her. When she visited the house where the items were stored, she found the possessions arranged in a tasteless and unpleasant manner, which made her feel disconnected from them. The objects reminded her of the painful past, the loss of her family, and the horrors of the war. Since the belongings were separated from her mother and kept in strange surroundings, they no longer brought her comfort or solace. This realization led her to decide to leave the memories behind and move forward, symbolizing her personal growth and acceptance to forget the address and the traumatic past associated with it.