Yay for having a decision. I'm glad you are comfortable with the decision and even getting excited about it. I think you're a great wife for considering hubby's feelings. It's tough when there is no acceptable compromise...I would not have been happy with DH knowing and me not so I would have gone the same way as you.
I would have been fine with just him knowing to be honest, but after thinking about it for a while, I know he'd feel HORRIBLE if he accidentally let the secret out and I don't want him living with the memory of "blowing it" for me. So this is just the best route to go in the situation for us