This isn't a full-blown analysis of the track, I just wrote a short article about it...
Sample:
What’s so great about the lyrics here is the fact that Em really dug down into the psychology of love and attraction, and all of the consequences, and emphasized the best and the worst. He doesn’t gloss over the darkness and he doesn’t simplify or over-dramatize the light.
To anybody who's interested in reading the full thing, you can do so here. Cheers.