Specifically...if your WAS is cheating, please don't try to believe that they have had a change of heart toward you just because they were nice to you one day, especially when you know they were recently out to see their affair partner.
Yeah -- I don't think there's a change of heart on the A.
In fact I fully expect it to continue when she moves out.
But as Puppy himself has asked on many a thread, is that a dealbreaker for you?