Well, it looks like you got what you wanted. You don't want to confess, and now you have people on here confirming/affirming your reticence.
You haven't shown any honesty, decency or respect for your H so far, so why would you want to start now?
I would say one thing. Statistically, marriages have the best chance of recovering from affairs when the "betrayed partner" finds out because the "involved partner" confesses, out of remorse, guilt, sorrow or what have you. It is much harder to come back from if your H finds out another way, which in all likelihood he will. Have you 100% covered your tracks? Is there no possibility of stray texts, emails, photos whatever?
Also if your H has responded to his suspicions by drawing closer to you, surely that is a good sign, that he doesn't want to lose you, so might not resond by an instant divorce.
Although of course I'm wasting my breath. Like all the other OPs who post "should I shouldn't I tell?" the end result is always the same. Feel free to ignore, there'll be plenty more posters along in a minute to tell you it would be better NOT to be honest or truthful. Why break the habit of the last few months? 
Oh yes, it would be much better for the children for them to be raised in a marriage with no honesty or respect. It's much better to teach them they can behave however they like, with no thought for others, and then try and cover up and get away with it as best they can.