Shame motivates withholding.

from Anna Karenina by Leo Tolstoy page 201 fiction ~2 min read

Though Anna had stubbornly and bitterly persisted in contradicting Vronsky when he told her that her situation was impossible and tried to persuade her to reveal everything to her husband, in the depths of her soul she considered her situation false, dishonest, and wished with all her soul to change it. Coming home from the races with her husband, in a moment of agitation she had told him everything; despite the pain she had felt in doing so, she was glad of it. After her husband left, she told herself that she was glad, that now everything would be definite and at least there would be no falsehood and deceit. It seemed unquestionable to her that now her situation would be defined for ever. It might be bad, this new situation, but it would be definite, there would be no vagueness or falsehood in it. The pain she had caused herself and her husband by uttering those words would be recompensed by the fact that everything would be defined, she thought. That same evening she saw Vronsky but did not tell him about what had happened between her and her husband, though to clarify the situation she ought to have told him.

When she woke up the next morning, the first thing that came to her was the words she had spoken to her husband, and they seemed so terrible to her now that she could not understand how she could have resolved to utter those strange, coarse words, and could not imagine what would come of it. But the words had been spoken, and Alexei Alexandrovich had left without saying anything. ‘I saw Vronsky and didn’t tell him. Even at the very moment he was leaving, I wanted to call him back and tell him, but I changed my mind, because it was strange that I hadn’t told him at the very first moment. Why didn’t I tell him, if I wanted to?’ And in answer to this question, a hot flush of shame poured over her face. She understood what had kept her from doing it; she understood that she was ashamed. Her situation, which had seemed clarified last night, now suddenly appeared to her not only not clarified, but hopeless. She became terrified of the disgrace which she had not even thought of before. When she merely thought of what her husband was going to do, the most terrible notions came to her. It occurred to her that the accountant would now come to turn her out of the house, that her disgrace would be announced to the whole world. She asked herself where she would go when she was turned out of the house, and could find no answer.

—Leo Tolstoy, Anna Karenina, p. 201