Although I think it's really about Oli's addiction, I also have a different interpretation of the song (due to personal experience):
This song mainly talks about love, love which seems it has ended up. Though, it doesn't matter if the relationship is broken, "Tides will bring me back to you". That sentence would sound to me, something like, "It doesn't matter if we split up, one day we'll meet again and we'll together again" (like if someone in the relationship died also).
Furthermore the sentence "Don't try to fight the storm, you'll tumble overboard" means that fighting is worthless because the relationship will end up anyway (but there will be a comeback...).
I love this song, it is really really emotional, so sad, sullen, deep and dark also!
Although I think it's really about Oli's addiction, I also have a different interpretation of the song (due to personal experience):
This song mainly talks about love, love which seems it has ended up. Though, it doesn't matter if the relationship is broken, "Tides will bring me back to you". That sentence would sound to me, something like, "It doesn't matter if we split up, one day we'll meet again and we'll together again" (like if someone in the relationship died also). Furthermore the sentence "Don't try to fight the storm, you'll tumble overboard" means that fighting is worthless because the relationship will end up anyway (but there will be a comeback...). I love this song, it is really really emotional, so sad, sullen, deep and dark also!