John Proctor reassures Elizabeth and says, "Fear nothing.
Abigail’s jealousy and evil intentions brought suffering on his loved ones who were either jailed or executed.
However, John Proctor fought bravely for his loved ones and his reputation even in the face of death.
It is not clear what lead John Proctor to having an affair with Abigail Williams, but perhaps it is because Elizabeth Proctor was a very demanding and challenging woman, which in return caused their marriage to fall apart.
Abigail Williams, who mistakes John Proctor's sex for true love, wanted John to leave Elizabeth and marry her.