For the most part, you have the right to disclose or not disclose information on your private live to your partner as much or as little as you please. You just

For the most part, you have the right to disclose or not disclose information on your private live to your partner as much or as little as you please. You just can't demand there won't be consequences when they find out. And you can't force other people to respect your decisions if they find out. So, no. If you cheated and someone finds out, they are under no moral obligation to shut up about it. There are of course exceptions (e.g. if you're a woman in a country that applies Sharia law) but as a general rule: if you fuck up and lie about it, you should think about it as a delay rather than a way out.