In a dingy studio apartment in the city's downtown, Robert Kenneth Leavitt began with a confession. "I am a level 3 sex offender," he said, holding hands with his fiancee, leaning a tattooed forearm on his knee. "I'm not going to try to deceive you. I'm being straight-up honest. I look back at the man I was, and I see a darkness that I would not want in the man living next to me. I know you don't find too many people who will give you a second chance."