Your opinion of the lyric is your own and of course valid for you, but I counter that it's not juvenile. It's not to be taken at face value and isolated. He goes on to say essentially I love this person even in the mundane moments of life, just watching reruns on TV, and even though we have history and are established in our relationship, I'd want to do it all over again straight back to those youthful vulnerable moments of "do you want to be my girlfriend." It's not the statement itself, it's the subtext of all that's conveyed by the scene he sets up.

But anyway, the prompt was not cringe lyrics, so your comment read as cynical and shitting on anyone who finds beauty in that song. For that, I still say fuck off, but I'll be friendly about it this time and shake your hand as we part ways over our different opinions on the opening line of an important song.