Me: FWH, 35
Also agree with Karma - his attitude in telling your husband is key here.
If he is regretful, he should definitely tell. I am in the exact same position as he is (i.e., married with kids).
I had my issues, and I confessed to my wife - albeit with TT.
I never told my friends about what happened, so there is no risk there, but I just couldn't hold it in.
There are those on here who will tell you that they don't have to tell. I don't disagree with them - each situation is unique and different, but given my situation, I will ALWAYS recommend telling the truth.
Even if it's telling the truth about something shitty, you're already becoming a better person by owning it and not hiding anymore.
Her: BS, 34
Married: 7.5 years
Together: 10+ years
Kids: 2 Boys under 5
"The truth shall set you free, but first it will make you miserable."