Girlfriend,
To answer your question about 'where will he go and what will he do?'...I asked the same thing about my son. Once I became well acquainted with alot of the residents in the halfway house where my son often stayed; I learned just how resourceful a person can be when it comes to picking up the pieces and getting back into life. Once my son began to take responsiblity for himself, he was motivated because he regained the long lost confidence and self esteem needed to make it in the world.
There are plenty of people and resources where he can go to for help and it's up to him to find that help. It wasn't easy for me to let go, but I'm so glad I did because it was the best gift I could give to my son. He got his self esteem back by working hard and doing the 'next right thing' which gave him the motivation and desire to stay clean.