My boyfriend just smoked crack last weekend. He is a recovering addict. What do I do now?

I want to be there to help him but I know that I don't want to be a man who smokes crack. I think I should just stay away from him but I'm also afraid he is going to commit suicide. I am very co-dependent so I really want to help him but at the same time I know I cannot help him. Any Advice?
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