What does Slim mean when he says, "A guy go to sometimes."

Here Slim takes on the role of priest. After crushing Curley's hand, Slim sits next to a distraught Lennie and reassured him that a guy has the right to protect himself,

Slim came directly to George and sat down beside him, sat very close to him. "Never you mind," said Slim. "A guy got to sometimes." Pg. 96