Lyrically, the song follows a repetitive pattern, where each stanza practically follows the same layout. He ends each stanza by saying that he's falling in. The repetitiveness shows how he's trapped, and unable to escape from "fallin in." Also, the last line in the last sentence says, "I might as well fall in." This shows how he's unable to deal with the situation he's in, so he'll give in just to end his pain. I think he wrote this, because it elaborates on the idea of how this man is trapped in this endless cycle. In turn, he offers a solution by giving in to giving up. While a depressing ending, it shows how some people cope with their issues. In this case, he decides that this man copes by giving in.
This song isn't about happy endings. Instead of saying that everything is all right, it's more about the real struggles of how people deal with their problems. It shows how everything in the world isn't perfect, because the world isn't that simple. In this scenario, it's difficult for the man in this situation to cope with his problems, In turn, it's creating this harmful circle that is trapping him from facing the truth. When the song comes to an end, there's no light at the end of the tunnel. Instead, there's this eerie, abrupt stop, that leaves me wondering whether the man in this song overcomes his problems, or lets it consume him.