what goes around...comes around...is dedicated to????

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which one of jt's ex's do u think the song what goes around comes around dedicated to? coz i was kinda confuse, at first i had this hint that it's totally dedicated to britney but then again, it was 5 long years ago, and to think is he still not over his heartbreak with her yet? but when i heard the line from the song which goes " the funny thing about that is, i was ready to give you my name.." suddenly made some bells rang, coz wasnt he ready to marry cameron but the she doesnt want to that's why they broke up, coz she said she's a commitment-phobe...so i was just thinking what would you say about the song and who is it for? so if you have some conclusions, please feel free to leave it here ok...thanks...