How utterly selfish of you to think the only person who should be learning from this experience is yourself. He needs to understand what to look for, how to properly vet his next partner, what questions to ask. You owe him at least that. You also owe yourself an incredibly painful experience... watching him suffer through what you tell him. Because if that experience is painful enough for you... then maybe you will remember what it was like and change your ways in the future.But it’s not his fault. It’s mine 100%.
I should’ve seen that from the first time I cheated. It’s all me. I will not crush him harder with a betrayal. I feel this is the right thing.
You need to tell him. Everything. Because you, YOU, have no idea what is enough, what is not. That's for him to decide, not you. You need to release your control.