Sounds more along the lines of what kruemel is saying. It's probably about how someone was hurt. And the hurter didn't truly know how much he/she hurt the other person. "If you should ever see the pain in me, you'd wish it away." Probably implies that there's still some care involved in their relationship, and if that person could see how much the other person had been hurt, they'd try and make amends.
Sounds more along the lines of what kruemel is saying. It's probably about how someone was hurt. And the hurter didn't truly know how much he/she hurt the other person. "If you should ever see the pain in me, you'd wish it away." Probably implies that there's still some care involved in their relationship, and if that person could see how much the other person had been hurt, they'd try and make amends.