Gravity

Gravity = EX-boyfriend

easy as that =]

She broke up with a guy, he wants her back, she wants to move on, he clings on, she tells him he's better than that

"You're never gonna thrill me, but you can kiss my ass so NANANANANA. Woahh You're bringing me down." I'm guessing he's hostile about her control over him. If he didn't care (if he were indifferent) he wouldn't be so angry. In other words, he protests too much :)

Exboyfriends, what? I can't figure out how this song is about exes. Just watch the official video of the song, it gives you the clue. According to that the song tells the scenario of how individuals are treated when they are doesn't fit into the crowd and the hard battle between their confidence and the crowd's hurting words.

My interpretation looks like somehow this: "I'm on the other side of things, you know I'm on the other side of things"
Says I'm not like you, I'm different, I see things otherwise.

"Well I'm not gonna hear anything you say I'll listen but I won't let it in my way" I don't let your opinion to ruin my personality

"Up above, I'm looking at the heavy ground I can feel it, but it wont let it drag me down" Even though, I believe in myself, the more people critizes me, the harder to keep standing.

"Woahh You're bringing me down Pick it up! Pick it up! Pick it up! Pick it up! Woahh you're bringing me down Pick it up! pick it up! pick it up!" It's getting hard to stand up for myself, the crowd is bringing me down, let's pick myself up from the ground fastly and rebuild my confidence.

"Don't prostitute yourself You're selling yourself out You're a better man than that And time will show you" Don't change yourself to fit into the crowd, you value more than that, just keep doing what you doing and it will bring the success.

So basically, "gravity" is the force of conformist critics' pulling down an individual.