Is it sometimes better to keep hurtful information from your partner?

It seems like so many people cheat on their partners these days. And many of those people tell their s/o and later, their relationship ends because of it. I’ve cheated in the past and I did tell my s/o. It hurt him. Bad. Thinking back, I now wonder why I decided to tell him. I knew it would break his heart. I also knew that if he decided to stay with me, he’d be a very paranoid, jealous, and suspicious boyfriend for a long time afterwards. So do we spill the beans because it gets it off our chest? The guilt eats us up? What harm would it do to not tell our s/o’s when we made a mistake (like cheating)? Of course we should always be honest be with our partners, but wouldn’t it be a little more thoughtful of us if we kept some things to ourselves? Just think of all the relationships that might possibly be saved if we didn’t all shout it from the rooftops when we make huge mistakes. Maybe it’d be better if we suffered on the inside instead of forcing our s/o’s to live through that pain also?