what does Dimsdale decide to do in chapter 12?

Dimmesdale, having left his house, walks until he reaches the scaffold where Hester Prynne suffered her public humiliation several years ago. He climbs the stairs and imagines that he has a scarlet letter on his chest that all the world can see. While in this state of mind, Dimmesdale screams aloud, and he is immediately terrified that the whole town has heard him. Instead, only Governor Bellingham briefly appears on his balcony before retiring to bed.