In The Scarlet Letter, why does Dimmesdale seem to be hiding something during his conversation with Chillingworth?

Inof
"",already suspectsof being the father ofand he is digging, trying to find out if he
can coax the truth from the minister. Dimmesdale seems to be hiding something because he his the
father of Pearl and does not want to admit it to anyone. In a conversation about hidden sin that
is filled with innuendo and double meaning, Chillingworth taunts Dimmesdale . The minister
says,"that the hearts holding such miserable secrets as you speak of will yield them up, at
that last day, not with reluctance, but with a joy unutterable. Chillingworth then asks
"Then why not reveal then here?  This makes Dimmesdale very uncomfortable and he clutches
his chest and answers, "So, to their own unutterable torment, they go...