Son Owed Dealer $

I have never told anyone this it has been a dark secret but want to get it "off my chest". My son had a bad heroin addiction with 2 close friends who were also like 2 sons to me and they both OD'd and died. My son got caught and went to jail but he owed his dealer a lot of money and he basically said he knew people in jail with my son and he could have him hurt or worse. He said he would wipe the slate clean if he could have me. I refused and cussed him out I would never do something like that! The next morning I get a call that my son was in a fight and got a few broken ribs and one punctured his lung. I felt I had no choice at that point so without my sons knowledge me and his dealer started having sex.