I understand your concerns about your son's relationship with this girl and can only imagine how challenging it is for you as a parent, to try and guide your son into making healthy decisions about relationships whilst he is probably learning all about that himself. I can see that you care about your son's wellbeing, and having his friends and other people in your life validate your reasons for being concerned about this girl would only make you feel more stressed about the whole situation.
You mentioned a few concerns about this girl, I am wondering what it is about her lack of supervision concerns you? It is great that you have some people in your circle that you can talk about this with. They also sound like experienced parents, I wonder if you could talk with them and perhaps seek some guidance around how to talk with your son about your concerns?
We also have a resource here about how to help teenagers have respectful relationships. There is also an article here about how to talk with teenagers about sex, as you mentioned you have tried teaching your son about healthy relationships. I hope the articles help. It sounds like you have a lot going on and it must be quite stressful for you at times. Please remember to take care of yourself too!
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