Lyric discussion by HFaerie 

It's about a guy whose girlfriend cheated on him.

'Then think of what you did And how I hope to God he was worth it. When the lights are dim and your heart is racing as your fingers touch his skin.'

He's asking if it was worth it to cheat on him. He thinks she'll never have someone better than him, and she had him, until she cheated on him.

'I've got more wit, a better kiss, a hotter touch, a better fuck Than any boy you'll ever meet, sweetie you had me Girl I was it, look past the sweat, a better love deserving of Exchanging body heat in the passenger seat? No, no, no, you know it will always just be me'

He's asking her to look past the testoserone. Past the moment, at the long-run. Was this boy she cheated on him with really more worthy of having sex with her than the narrator? No. She'll always love the narrator, and she's blown it.

'Let's get these teen hearts beating. Faster, faster'- talking about the thrills of sex.. and the fear of getting caught making their hearts beat faster.

'Testosterone boys and harlequin girls'- boys controlled by their lust, and girls who are fools. He's making a general statement about boys who are only after sex, and the girls who are made to look like idiots, because they have sex with the boys. (Eg the girl the narrator was with is made to look stupid, beause she sacrificed her perfect relationship for sex with this boy who only wanted to use her for the thrill of it).

'Will you dance to this beat, and hold a lover close?'- Will you go the same root as i'm describing?

Then he talks about the guilt that comes after the cheating...

'Oh now I do recall, we were just getting to the part Where the shock sets in, and the stomach acid finds a new way to make you get sick.'

'Now let's not get selfish' is ironic, since the girl has been selfish by having another lover.

@HFaerie this interpretation of the song is amazing, thankyou for clearing it up for me!

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