Could I get a private post please. Not baby related. My sister has been having a…

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Could I get a private post please. Not baby related.
My sister has been having a relationship with a guy for a few months now. This guy has a girlfriend of 10 years. All our family know and we have all expressed our concern and disappointment. She states she doesn’t care. She is going through a period of anxiety and mild depression and basically uses this to justify her actions that “her heads all over the place”. I have tried my hardest to get her to stop and am at a point now that I want to tell the guy’s girlfriend. I know my sister will more than likely get hurt but I feel like the girlfriend deserves to know. What would you do?
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