In the play The Crucible, what are the consequences of Abigail and John Proctor's affair?

On the
domestic front, the affair leads to a breakdown in trust between Elizabeth and John Proctor.
John had always been such a good husband, yet now he's been exposed as an adulterer. Elizabeth
doesn't know if she can truly trust him anymore. If he could cheat on her with Abigail then why
not with someone else?

The most serious consequence of the affair, however,
is that it gives Abigail an excuse to exact a terrifying revenge on John and Elizabeth. Abigail
didn't want the affair to end, and when it did, she felt like she'd been discarded like a piece
of trash. Furious at how she's been treated by both John and Elizabeththe mistress of the house
fired Abby after the affair came to lightAbigail sets out to destroy the Proctors.

Later on in the play Elizabeth will try to defend her husband's reputation by openly
denying in court that he had an affair with Abigail. It's a complete lie, of course, but one
that Elizabeth hopes will ensure that the...