Kindeyes, I can not relate to your exact situation seeing none of the addicts i my life have ever even tried recovery of any kind. However, as a mother I can imagine how I would be feeling.
Sorta, like each time my oldest son gets out of jail I know he is clean yet, he goes right back to the drugs( he has no tools)
Thankfully, your son will have some tools I pray he chooses to use them.
As, for you I think you have handled this entire process very well since he went into rehab. I was touched by your courage and strength when this new journey beagn.
Sending hugs and prayers your way.