What does Elizabeth want John to do in town? What will everyone find out if he does this?

Elizabeth tells John to go to Ezekiel Cheever and tell him what Abigail said last week - namely that Betty's sickness had nothing to do with witchcraft. Proctor tells her that nobody will believe him, as Proctor was the only one to hear. John is worried that the people in town will find out about his affair with Abigail.