Well, you can't kick the drugs and alcohol without kicking the crack whore and her drug buddies

Do these people have sex before marriage or is the man trapped in a long engagement with a woman who's drunk and high and doesn't care about or even notice the lack of intimacy and communication?

After I Kicked Drugs and Alcohol, I Found a New Addiction: Cheating on My Fiancée
Thirteen years of sobriety taught me that the most dangerous thing for an addict isn’t getting caught—it’s getting away with it. And I keep getting away with it.
Advanced 12-step work taught me a strange paradox: Sometimes you have to sit with the agonizing truth that you are doing something wrong. That you aren't ready or able to stop. I've built 13 years of sobriety on the idea that we are only as sick as our secrets. But I should admit something up front: I'm good at telling stories, especially about myself. Even now, I catch myself deciding which parts to share. So here it is: For the better part of two years, I cheated on the woman I'm going to marry. She still doesn't know.

It's high time to bail and get clean and sober again, isn't it?