Blowing up is just how Deacon is. He has always blown up when things didn't suit him. He just blows, quits and storms out the door. This time he added the booze. It's who he is, even when he doesn't drink. It's such a turn off for me. Juliette is a lot like that too, as is Gunnar. I think there are too many Nashville characters like that. It's seems like lazy writing to me.