I think there is more than way to interpret it, it could be a getting over you ex song like everyone says or it could mean getting over addiction. As you notice in the video the girl seems to be an alcoholic and the guy seems mad as he sees her drink and drink.So when the songs starts up with I never saw it coming it means he never say the addiction coming and how it would affect her life to the point were she lost her boyfriend either to an accident with the car or because he broke up with her after seeing how she was behaving due to her addiction which almost made them die. She is devastated because as I said before he died or he broke up with her, but the meeting she is going to is for her alcoholic addiction like alcoholics anonymous.