What would you do?

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Ok, I have a girlfriend that will stay home most of the time, just enough until I start trusting her again, and then just disappear for 2 days getting high. Now, I know the things that people do when they want money for drugs; she doesn't have a job, and when I first met her, she was doing anything she could to make money for drugs. When I run into her after she's left, for example, if I go through the area where she usually gets high, I always see her with a male counterpart. Should I dump her, or should I stick with her?