Where was his fault

Their greetings were conventional, but she looked at him, breathless, wondering, eager. He was courteous, adamant, waiting her explanation. With womanly swiftness she took her cue from his manner, and turned to snow and ice. Thus, and wider from this on, they had drifted apart. Where was his fault? Who had been to blame? Humbled now, he sought the answer amid the ruins of his self-conceit. If-- The voice of the other man in the room, querulously intruding upon his thoughts, aroused him.