Some of the worst decisions I have made were ones made out of fear..
Today the only decision you need to make is the one to take care of YOU!! The rest will fall into place at the appropriate time :-)
You can't worry about whether he will use again or not, he's an addict and he's gonna do what he's gonna do.. If he's not working a strong program then chances are he's going to use again.. That's the harsh reality of addiction
The only thing you can really control is you and your actions and your reactions...
Hang in there and take things One Day At A Time!!