Hon, if he is going to go off and do something stupid, he'll do it whether you are around or not. Remember this?
One time he even left for a couple days without talking to me and just stayed at some girl's house (who turned out to be really crazy) and drank all the time.
It sounds as if you think you can control what he does, but you cannot. Hopefully, you will come to realize that sooner rather than later. Good luck.