I believe this song to be about either the pain of love, or the way love helps pain, or both. Perhaps things "hurting so good" refers to how maybe nothing really hurts when he's with this girl, everything that hurts is or feels good; all is fine with her. On the other hand, perhaps it refers to some sort of issue in a relationship that hurts, but the feeling of love for this girl still feels good? I don't know, I'd be more confident in my first interpretation.
I believe this song to be about either the pain of love, or the way love helps pain, or both. Perhaps things "hurting so good" refers to how maybe nothing really hurts when he's with this girl, everything that hurts is or feels good; all is fine with her. On the other hand, perhaps it refers to some sort of issue in a relationship that hurts, but the feeling of love for this girl still feels good? I don't know, I'd be more confident in my first interpretation.