My wife and I told each other everything - good and bad - about each other while we were dating and before we even got engaged. We both took a risk doing this since we had skeletons in our closet but the truth set us free and the other person accepted it and was glad to know instead of stumbling on it 20 years later.
But what has been a deal breaker for you about something someone told you despite them being 100% honest with you? What was the story that was too big for you to handle and that you couldn't get over? Or..........what WOULD be a story from the past that would be too much for you?