You see a lot of threads on here where a former or current OW wants to tell the wife about the affair -either through remorse, or vindictiveness, or jealousy - and is told not to as they're doing it for selfish reasons.
But you also see a lot of threads from wives/partners saying they would want to know.
But surely it's either better to know or it isn't, regardless of who the message come from?
So
YABU - It's better to not know than to hear it from an OW
or
YANBU - it's better to know even if it comes from the OW