I say hold it in to most people. Tell people who are promarriage and have the power to put pressure on the affair. Who could those people be? It is an addiction like alcoholism and most addicts do not listen to anyone but other addicts.
If you do tell people make sure they know you want to be supportive of your H's return not of his affair.
In my experience the only people who really understand are people who have been through something like this so telling outsiders is fruitless. It feels good at the time to share but then it gets mired. It feels like TMI!
I did tell a coworker I trusted then regretted it because she just said, "I am so lucky my H never did stuff like that."
I told someone in my Mom's Group who is a Scout Leader and now her D does not play at our house because of my perverted H.
So, try to not say anything unless it is someone you really trust.
Me:38 H:39 MLC M:10 R:23 years D6 S3 Bomb: Easter, 2007 "Every day may not be good, but there's something good in every day."