"As soon as it happened. But... I needed to be in a place I could do something about it and know for sure before I told you. I didn't want that to be a hope that could be taken away from you."
Other options:
Re: Rarity
"As soon as it happened. But... I needed to be in a place I could do something about it and know for sure before I told you. I didn't want that to be a hope that could be taken away from you."