Why does chillingworth think he has a double reason for punishing dimmesdale?

Chillingworth believes he has a double reason for punishing Dimmesdale because, as Hester Prynne's estranged husband, he feels betrayed by both Dimmesdale's affair with Hester and the minister's failure to confess his sin. Moreover, Chillingworth sees Dimmesdale's hidden guilt as a source of inner torment, which he seeks to exacerbate through psychological manipulation. This dual motivation stems from both personal vendetta and a perceived moral obligation to reveal the truth.