Why did Patty tell Ruth about Anton hiding in the garage?

In Chapter Eleven, Ruth confronts Ruth about Anton. She had seen him as he ran out of the garage to help her. Patty is reluctant, but tells Ruth the truth because she trusts her. Ruth is worried and confused, but she makes Anton a hearty breakfast. Patty tells Ruth Anton is her friend and likes her. Ruth agrees, after all, he had risked his life to help her, and is the greatest love there is