I see it as a statement on the irony and seeming futility of attraction, in general. Sometimes, regardless of the mutuality or depth of the feelings ("and you want her, and she wants you"), the two people are incompatible. However, in spite of these circumstances, attraction is natural ("we want everyone"), and it's going to keep happening. It's no one's fault for trying and failing, because we're all susceptible to our own humanity ("no one ever is to blame").
And although these kinds of failures are disheartening ("the insecurity is the thing that won't get lost"), the overall sentiment of the song promotes the inevitability of the cycle, and that it'll keep continuing.
I see it as a statement on the irony and seeming futility of attraction, in general. Sometimes, regardless of the mutuality or depth of the feelings ("and you want her, and she wants you"), the two people are incompatible. However, in spite of these circumstances, attraction is natural ("we want everyone"), and it's going to keep happening. It's no one's fault for trying and failing, because we're all susceptible to our own humanity ("no one ever is to blame").
And although these kinds of failures are disheartening ("the insecurity is the thing that won't get lost"), the overall sentiment of the song promotes the inevitability of the cycle, and that it'll keep continuing.