Lyric discussion by brkn social scene 

Cover art for Drop lyrics by Red House Painters

I have loved and listened to this song for years. To me, it has always been about someone in love with someone who has cheated on them, maybe even been nasty in some ways.

"if only i were blind to your selfish fling and your desperate cause and didn't press you for the details that threaten my physical flaws"

I believe that refers to finding out the details of the cheating/the betrayal. Then being insecure because the "other person" was maybe better looking, in better shape.

There is a real struggle because one loves the other but perhaps knows they are being cheated (in more ways than one).

It's about being deeply in love with someone that you know you shouldn't be because they don't have that same commitment.

That's what I get from it anyway.