In short, I think the singer is ready to move on from a hurtful relationship.
"I know that I'm in danger of unravelling. But believe me, I'm fine with it because I'd rather fall apart than hold it all together.":
He knows that he's in danger of falling apart after the break up, but that would be better than trying to make it work.
"Broken words come from healing hearts":
He's finally feeling better, and is ready to break up with the girl.
"You better hit the deck, I'm ready to talk":
Watch out, because I'm about to let you have it.
In short, I think the singer is ready to move on from a hurtful relationship.
"I know that I'm in danger of unravelling. But believe me, I'm fine with it because I'd rather fall apart than hold it all together.": He knows that he's in danger of falling apart after the break up, but that would be better than trying to make it work.
"Broken words come from healing hearts": He's finally feeling better, and is ready to break up with the girl.
"You better hit the deck, I'm ready to talk": Watch out, because I'm about to let you have it.