Lyric discussion by sadchild 

I think "Broken" is about a person watching a friend who has a condition that is either lifelong or it just started but the person was predisposed to it from birth, like autism or Alzheimers.

"You see the friend that I knew cannot be found, replaced by another, wearing his crown" - The friend's condition is deteriorating, (s)he's getting worse.

"There’s a place where I go without any sound. Only you can reach me. Only you’re allowed." - This is from the point of view of the person suffering the condition. Really fits autism. Also really fits Alzheimers.

"When you were a child, you'd dream all day long. You'd dream of the future, get lost in your songs." - This screams autism to me.

"Words long forgotten, forgotten somehow." - This screams Alzheimers to me.

"You were broken from the start." - The condition is either lifelong or the person was born predisposed to a condition that is now consuming them.

I submitted a change to the lyrics that are currently there to match what I put in this comment.

Personally I think it's more about self-inflicted "pain". Lines like "the friend that I knew" and saying that his friend "lost the crown", meaning he was normal once. I would tend to agree with Solresol who says it's about personal demons/drug addictions.

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