I think that this song is directed at someone he's bullied previously and regrets it. 'I feel overjoyed' may be sarcastic considering how his words are 'crawling under [their] skin'. He's mocking himself for what he's done. This person is depressed and needs help, but he took a stab at them instead and he's saying how terrible of a decision it was. 'Words are all we have' is him trying to justify what he did and 'I hear you calling' is him finally understanding that this person needs help.
I think that this song is directed at someone he's bullied previously and regrets it. 'I feel overjoyed' may be sarcastic considering how his words are 'crawling under [their] skin'. He's mocking himself for what he's done. This person is depressed and needs help, but he took a stab at them instead and he's saying how terrible of a decision it was. 'Words are all we have' is him trying to justify what he did and 'I hear you calling' is him finally understanding that this person needs help.