I think she loved Andrei and yet had been with Sergei longer though she didn't love him romantically and thus she couldn't force herself to end the affair with him, until he died in the Revolution. Sergei who knew she didn't love him as he did her even proposed to her around the time of the Revolution, and she had to turn him down. So he obviously never gave up. And she truly loved Andrei, so she didn't want to leave him.
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