This song seems to me to be about a guy who is watching a girl he cares/cared about do something very stupid. She's going off with a guy who is shallow and will probably hurt her. My take on the line "I'm just the kind to bring you down" is that he's beating himself up about his outlook on her relationship. He's wondering if he's only seeing this guy she's dating as so bad because he cares about her. "Every time I hate you I think of you first" is saying that when he starts to think about her, he hates her because she's doing something he doesn't respect and yet he still can't stop thinking about her.
This song seems to me to be about a guy who is watching a girl he cares/cared about do something very stupid. She's going off with a guy who is shallow and will probably hurt her. My take on the line "I'm just the kind to bring you down" is that he's beating himself up about his outlook on her relationship. He's wondering if he's only seeing this guy she's dating as so bad because he cares about her. "Every time I hate you I think of you first" is saying that when he starts to think about her, he hates her because she's doing something he doesn't respect and yet he still can't stop thinking about her.