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Self-destructive means doing things that might cause physical, economic or other harm to oneself.
Here's Merriam Webster's entry for co-dependent:
Main Entry: co·de·pen·den·cy
Pronunciation: -d&n(t)-sE
Function: noun
: a psychological condition or a relationship in which a person is controlled or manipulated by another who is affected with a pathological condition (as an addiction to alcohol or heroin)
- co·de·pen·dent /-d&nt/ noun or adjective
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