Most Helpful Guy
I'm going to make a controversial blanket statement here... but I really have a low opinion of anybody who believes that.
Why? Because people have the ability to change for the better, and anybody who actually HAS changed for the better and learned from their mistakes, knows this. Ergo, the only people who believe you can't, are the ones who have been unable to do so. They believe that because they have no drive to become better, that nobody else does either.
Most people will continue to cheat, but if your mistakes don't define you.
Most Helpful Girl
I don't believe that. Some people won't be able to help themselves and they'll cheat over and over again; other people will cheat once and never want to go through the pain it caused to their relationship again. Each case is different, people do it for multiple reasons, so I don't think we can generalize.