None of us can say why she is doing it, we dont know her, her family, her past, etc we could all sit and theorize if she has a disorder and that doesnt matter, why? Because she is not getting it treated... Labeling her "appropriately" wont make her stop.
Deco she does not seem to be over the ex, dont you feel like she'd drop you in the blink of an eye for her ex?
Personally I'd tell her I know what she is doing and it is not healthy in fact it's down right illegal and I would tell her she needs to go to therapy or move out, this problem will not go away just by her trying, Id also go with her to therapy because I wouldnt take her word on it, people who like being needed are the most resistent to seek help and go to therapy
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