Sure. Communicate. Long enough to tell her you have feelings for her and you're not ok seeing her do herself such an injustice. Then leave and don't look back.
If she dumps him and calls you, great. It's a new day. If you're smart, by then you will have already found someone who isn't so hooked on drama and just... likes you.
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"take me down, little *Susie*, take me down
I know you think you're the Queen of The Underground"
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