* Fear of retribution: Abigail is a powerful figure in the town and has the support of many of the leading citizens. Proctor knows that if he accuses her of lying, he will likely face severe consequences, including being labeled as a witch himself.
* Guilt: Proctor has had an affair with Abigail in the past, and he feels guilty about his actions. He is afraid that if he reveals the truth about Abigail, his own reputation will be ruined.
* Concern for Elizabeth: Proctor's wife, Elizabeth, is already pregnant, and he is afraid that if he gets involved in the legal proceedings, she will be harmed in some way.
* Loss of respect: Proctor has a high opinion of his own reputation and is afraid of losing the respect of his community if he is seen as going against the grain.
* Fear of the unknown: Proctor is not sure what will happen if he goes to town and tells the court about Abigail. He is afraid of the unknown and does not want to take risks.
In the end, Proctor's fear prevents him from taking action against Abigail, which allows her to continue her reign of terror in the town.