The Issue: “I’ve cheated on my partner – should I confess?”
If you want to keep your primary relationship my feelings are very strong on this one – definitely “not” confess. 

If it’s an ongoing affair and you want the relationship that you’re in to end, then, yes, tell your partner. But if you want to keep your relationship, you can’t have your cake and eat it, too. You hurt your partner doubly by telling them you’ve had an affair. So many people tell just because they are trying to get over their own guilt. They thing they’re doing the right thing but it’s not – it just makes them feel all “holy and squeaky” but the other person feels doubly injured.

The price you have to pay is to wear your own guilt and to fix whatever was the cause of the problem in the first place.