What is suspicious about dimmesdale and position in his debate with Chillingworth about sin?

Dimmesdale's physical deterioration and Chillingworth's relentless pursuit of him are suspicious elements in their debate about sin. Chillingworth's insistence on finding out Dimmesdale's sin and Dimmesdale's reluctance to confess show a deeper conflict between them that goes beyond a typical debate about sin. This tension hints at a more complex and personal connection between them that adds to the suspicious atmosphere.