I think that Lennie should have not kill Curleys wife but he should have never pick her up if he didnt have done that then George would havenot kill him with the gun also he has to face his problems not run away from it and george wasnt mad at him because he knew he had to do the right thing by put his friend down and saying that George took the gun from Lennie and shot him but Carlson or Curley wanted to shoot Lennies guts out.