Lyric discussion by Si-chan 

Cover art for Breathe lyrics by Michelle Branch

I honestly don't see this as much of a fight song, and much more as a forbidden (not so much unrequited) love.

I feel like she loves this guy, and he obviously has feelings for her as well, but for some reason they cannot be together. But, as we all know, that doesn't stop the sparks from happening. A couple of different lines are pointing me away from the fight theory and towards this:

I've been waiting for a chance to let you in - This suggests that they are not together, but she wants to be. (There are a couple other lines like this but I wont list them)

saying things we never meant to say - This says to me that whatever sparks are flying between her and this guy, they aren't supposed to say it. It may be true and they may both feel it, but it's somehow forbidden and therefore not a good idea to admit by talking about it.

This song says to me that she is trying so hard to either make this relationship work or make it stop, and having a rather difficult time of it. In the chorus, I do agree that she's kind of telling us how she's coping. But she isn't supposed to be with this guy for whatever reason, and is really wanting things to work out one way or another, but for now she's just stuck in limbo.