In Chapter 13 of The Scarlet Letter, why does Hester decide to reveal the secret of Roger Chillingworth's identity to Mr. Dimmesdale?

By , 's companionship of
Mr.has begun to take a serious toll on Dimmesdale. Whenspeaks with Dimmesdale, she is shocked by
his weakness, and she thinks that "his nerve seemed absolutely destroyed." Hester, by
expiating her own guilt over the past several years, has become stronger. Her years of
punishment and isolation have turned her away from passion to "marble coldness," and
instead of feeling, she is more comfortable now with thinking. Her many years of punishment have
given her time to reflect, and she wonders if she should have rescued Dimmesdale earlier from
the secret evil of Chillingworth. Now, seeing that Dimmesdale is on the brink of what she
regards as "lunacy," she asks herself if she might have stepped in earlier to spare
Dimmesdale. She feels that perhaps a lack of courage or loyalty on her part prevented her from
doing so. She now feels stronger, is able to help Dimmesdale, and wants to correct the error of
her past ways for not having helped Dimmesdale.