You know, a lot of people have embarrassing stuff about them on the Internet. Some of those people include former lolcows or borderline cases. The way these people have chosen to deal with these things is to just grow out of it and demonstrate that they aren't that same person from years ago. The main reason stuff from five years ago still impacts Chris so greatly is because he is still that same person from five years ago. Remember, Chris still thinks he was in the right with the Megan ordeal despite how many times he has been told otherwise.
Chris doesn't necessarily have to change his name to escape his past but he does need to change as a person. What's the point of him going by Chris Chandler if he's still going to act the way he does?