Today, i'm gonna answer all of the questions in your mind. Lauren is Greyson's ex-girlfriend.
Actually, greyson said that he wrote it because he wanted lauren to know that he will never forget what she did. So, I think that they may have been going out, or she cheated on him, but that's none of our business :) there must be a good reason between greyson and Lauren to end their relationship. oh yea, i heard the song 'broken heart' was for Lauren. but i think his other heart break song like heart like stone, slipping away, etc. were for Lauren too. (Actually i get a little bit jealous to Lauren. you know, greyson still thinking of her though)
well, this is the picture of the piano, with the name Lauren there :
