human nature for some people mate.
some peoples lives arent where they wanted them to be or they didnt fulfil there dreams or aspiration
happens more often then not.
some people find happiness in other ways, wife, kids, a different past time.
some get angry, bitter, and take trhat anger out on sucesfull people because to see that success eats them up inside.
i found myself doing it at times its hard not to, but better for your life if you can respect peoples achievments.