Have you explained that to him?
There's nothing wrong with being confused yourself, nor with working out issues privately as you go along. When you end up springing such a surprise on a partner, however, I think you do have an obligation to divulge why he's just now finding out about it and setting things to right. I won't fault you for not telling him previously--I just expect you to share with him your struggles with the issue and how you arrived where you are.
It's one of those communication things, too.