I take from this that you are very worried about this boy and all he is going through at the moment. Do you have the option of reaching out to a mother of this boy and letting her know how concerned you are about him. Or maybe the councilor at his school.
Breaking up at 13 doesn't mean that...
I don't think anyone expects you to take him into your heart and treat him like a long lost son.
He is coming over to meet you. So welcome him into your home and treat him kindly. He is a friend of your daughters, treat him kindly and trust her to live her life and know her heart. Be aware...