Wait, so are these lucid dreams, or not?

I think the interpretation is obvious, as much as I despise generalized dream interpretation. You said it yourself- she's an angel, she's with a guy she won't leave for you, the guy is essentially a smoker/drinker/drug user which you consider to the the opposite of an angel... and you want to save her from that situation.

I think the question you need to ask your self is, does she actually need saving? Or is it a situation that she is in because she chooses to be? She may not even consider those things to be bad, as you seem to. But more importantly, I think you need to realize that it is not your responsibility to "save" her anyways.