When George Finds lennie, what does Lennie expect him to do? How does George respond?

When George finds Lennie, Lennie's first reaction is to believe that Geroge is going to leave him.

George said quietly, “What the hell you yellin’ about?”

Lennie got up on his knees. “You ain’t gonna leave me, are ya, George? I know you ain’t.”

George came stiffly near and sat down beside him. “No.”

“I knowed it,” Lennie cried. “You ain’t that kind.”