I don't know what to think about this. I mean they are all adults but its just rubbing me the wrong way?

Found out my best friend since kindergarten has been in an open relationship with the parents of the child she's a nanny for. She's an adult she can make her own decisions but she's 18, she's been a nanny for them since she was 14. What do I do? Just let her be?

I don't know what to think about this. I mean they are all adults but its just rubbing me the wrong way?
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