Some of me thinks, that because of the lines "all that stuff you used to take, i'm glad you threw all of that away, cause now you look so great, you never need to be afraid, just know you went the right way" that maybe this girl has just gotten over an addiction of some sort, and they're just celebrating the fact that she's okay. also, i think he's talking about how she's changed and although she went through a rough patch, she's changed for the better.
Some of me thinks, that because of the lines "all that stuff you used to take, i'm glad you threw all of that away, cause now you look so great, you never need to be afraid, just know you went the right way" that maybe this girl has just gotten over an addiction of some sort, and they're just celebrating the fact that she's okay. also, i think he's talking about how she's changed and although she went through a rough patch, she's changed for the better.