When an addicted loved one is exhibiting increasingly alarming behavior, first of all, don't take it personally. Remember, it is not directed at you. This, unfortunately, the face of addiction.
You might be grumbling. You might be accusing, guilting or complaining. Or trying desperately to prevent them from going out. You might be brooding in a cold silence. This might be hard to believe, but your presence and your conversation, however negative, are something your loved one counts on, and expects from you.
Getting off of methadone is very hard. It has a long half life; it will feel like it is hanging on forever. If your son isn’t mentally prepared and supported for what will quite possibly be weeks of withdrawal, there is a chance he may relapse and use again to make himself feel better.