@ cool Wow. That lady blew me away.

As for the song itself... it's not really my cup of tea. I don't think the song effectively links the concept of Russian roulette to the risk of giving your heart to someone. For me it doesn't sound like a metaphor for anything at all, it sounds like she's actually talking about putting a bullet through her head. Some of the words don't make sense when you listen to the song as a metaphor. It seems that excuse was an afterthought or the song was just poorly written.