Read it through once

"Well, if that's what you think I'd better be off," said William, and he rose to his feet and stood looking at her. She sat quite still, not daring to raise her eyes; her heart was throbbing violently. Would he go away and never come back? Should she answer him indifferently or say nothing? She chose the latter course. Perhaps it was the wrong one, for her dogged silence irritated him, and he sat down and begged of her to forgive him. He would wait for her. Then her heart ceased throbbing, and a cold numbness came over her hands.