What metaphors are used in The End of the Affair by Graham Greene?

When Sarah decides to interrupt the affair with Maurice, he feels awful. His “self-pity and hatred walk hand in hand across the garden.” Here the author uses a metaphor to show that these feelings are in the head of Maurice right now, when his heart is broken. The garden is his head. Self-pity and hatred are his companions, who are together with him in his certain period of life.