Public Service Announcement (PSA):
It is not abuse to insist the cheater end the affair!
Someone needs to see this. Cheaters will pull out all stops to make the faithful spouse look like the bad person.
Insisting the affair end is a healthy boundary. It is respectful. You are simply refusing to accept ongoing abuse by making this insistence.
If a cheater resists, you have your answer. They would rather continue to abuse you than do the right thing.
It is past time to divorce someone doubling down on the way of the wicked!