by tomorrow we'll be amongst the leaves (джен)

After his death, Loki had two wishes to ask of his mother.
Or, in other words,Loki, after Thanos killed him, asked Frigga to erase himself out of Thor's memories, for he could not stand the thought of Thor blaming himself for his death and the thought of Thor broken because of him. Loki's second wish being that the late Asgard Queen, who now sat on throne beside her King, refused his own access to Valhalla - meaning the God of Mischief was nothing more than a lost soul with no purpose, trapped and unable to cross over.
All because Loki couldn't leave Thor behind.
Someone had to look after Thor; Loki couldn't do that in Valhalla, but he could do it here where he, the ghost, would follow Thor wherever he went, even if Thor had no idea who Loki was.
Even if Thor had no idea he ever had a brother.