I did the same thing with my as last year. Checked him into a detox and put $500 down. He did stay for a week, but when his girfriend wrote him a letter to tell him she was breaking up with him, he left and went straight to her house. Of course, she wasn't home, so he called me to pick him up. When I look back, I should have left him there. Now a year later, we had to throw him out. I'm not spending another dime. It's up to him now.
My thoughts are with you.