We all change throughout our life. If we didn't, the world would be full of a million astronauts and princesses while we rode around on unicorns or race cars.
Sometimes we change for the better, but sometimes for the worst. That doesn't mean you can't change again fix that bad attitude.
Those friends/family who stand beside us through both our good AND bad times are the ones worth keeping. They are the ones we can count on to be there when we most need them (even if we say we don't need their support). They might even nudge us and try to tell us to shape up.
Be sure to take a look at yourself before you point any fingers. Chime on!