This means you do nice things and are pretty inside by doing kind deeds.
It means that your actions convey beauty more than your looks. You're beautiful through what you do.
Either way, you're still pretty. I'm not too sure what the 'half' means. You can't win everyone with looks, personality counts too. If he's a genuine nice guy, then he'll accept you for you and he'll...
Well in the movie forrest gump they say stupid is stupid does. so i think that it is just a saying off that.
it means that if you do pretty things, you will be pretty and other ppl will see you that way