Why would it matter if it was Scarlett Jo, Paris H, or any other hot celeb... the song is about watching that person go on and become famous and literally outgrow her boyfriend. Jack writes about trying to accept that shes gone and trying to make himself believe that there is, in fact, a better love for each of them out there. Its almost like he tries to convince himself it will be okay.
Why would it matter if it was Scarlett Jo, Paris H, or any other hot celeb... the song is about watching that person go on and become famous and literally outgrow her boyfriend. Jack writes about trying to accept that shes gone and trying to make himself believe that there is, in fact, a better love for each of them out there. Its almost like he tries to convince himself it will be okay.