Brothers & Sisters,
"I'm better now" is a common phrase one might say after they've committed a wrong and have lived through whatever punishment they've had to endure. Unfortunately, I don't believe that it is their place to say something like this. For me, it's trying to over commit to the notion that the person has been reformed. It's not up to you to tell me you're a better person now. Your actions from here on out will convince me of such things.
I know I say we shouldn't judge people as it's not our place, but I also think that it also goes for telling me what kind of person you are. You could say you're a great person, but if you go murder someone does that still make you a great person? I'd argue that the answer is no, in the present tense at least. Does that mean someone who was evil can't become good? Not at all. Quite the opposite in fact if you ask me. If we consider evil to be the bottom of the barrel for humanity, then you've got nowhere to go but up.
Just look at the story of Paul the Apostle. Before he was Paul, he was Saul of Tarsus. He was what we'd consider an evil man before his great conversion and then becoming one of the people who helped build Christianity. So by that measure alone, I believe someone can be reformed and live a great life after many wrongs. But what I don't think is your right is to tell me that you're better now. Let me be the person to witness your great actions. Show the world you've changed and you'll never have to insist you have.