In the first Thor film (2011), Loki visits Thor in his exile in Earth and tells him that their father died, that "the burden of the throne" has fallen to him, and that their mother has forbidden his return.
Why did he tell him Odin was dead?
It seems to me that this lie was completely unnecessary. Thor had no way of returning to Asgard anyway, and, if anything, Odin being alive would have given a better excuse as to why Thor can't come back - it makes sense for Loki not to want to undo Odin's last wish while he was still alive. And later on, this lie was how Thor discovered Loki was manipulating the whole situation and why he was willing to fight back.
What was the point of this lie? Was it only to make Thor suffer?