I assume that you are talking about the part right at the end of the book. This is where Lennie has gone back to that place by the river after he has killed Curley's wife.
Lennie expects that George will give him hell. He asks George if George is not going to do it.
George says that he will not, but Lennie really wants him to. So George goes with his usual spiel about how much better his life would be without Lennie around, but his heart isn't in it because he knows he has to kill Lennie.
I agree with the first editor but I also think that Lenny is expecting George to tell him what they need to do next. Lenny is used to George fussing at him but also getting him out of trouble.
I think that Lenny believes that George will get him out of this situation as well because he does not understand the seriousness of it. He is also expecting George to fuss at him telling him that they have to leave again because of him. Lenny has a tremendous amount of trust in George and he does not think that George would let him down in anyway.