Welcome!!!
While I can't relate to the specifics of your story, I can relate to being involved with a crack addict not in recovery and draining myself-an important admission, my choice, she was just doing what crack addicts do-emotionally, physically, spiritually and financially.
You will probably hear this from some recovering crack addicts in this forum, they will tell you, walk-or run-away and don't look back. I would agree with that advice 100%.
And you may want to meet up with a wonderful group of people, at a place called Alanon, great support, they will teach you how to live.
Keep coming back, you'll find a lot of support here.