Should I divorce my drug addicted husband?

My husband and I married only a year after we met and have been married for (5)- years now, we have no children "Thank God" (though I do have a 17- years old son from a previous relationship) and out of the (5)- years of being married, the last (3)- years he has been using drugs "opiets". Everytime I accussed him, he would deny it and then when I found out that he was lying I told him I didn't want it in my life and he needed to get help. He would then promise me he would never do it again, saying our marriage was much more important to him. I'd give in and believe in him, over and over again like an idiot.... Several times, probably somewhere around a good twenty times in the past (3)- years but he never seeked any professional help. About (3)- weeks ago, I found out that he stole around $80,000. dollars from his teenaged cousins and another $15,000. or so from a sweet old man who adored my husband dearly. The money that he took from his cousins was money that was left to these children from their uncle who ped away nearly (4)- years ago and was left in the care of my husband until the children reached the age of 21. I can't even believe that he would do such a thing, I couldn't even take a pack of bubble gum and that amount of money, My God, that is a down payment on a house. I don't even understand, it's not like he was coming in w/new clothes, sneakers, etc. He has absolutley nothing to show for it!!!! He has told me that he was up to taking a total of (30)- oxycotton a day "I can't even believe he's alive if this is true" and he has stated to me that he has not even ever stopped within the past (3)- years. After finding all of this out and him comfronting his family of what he has done, I told him he had to get out and didn't care where he went but he could no longer stay here. He then asked that I drop him off at a rehab which is where he is now until Nov. 15 and from there he will be going to a halfway house for 8-12 months because I told him and his counselor that he can not come here. I don't need it and my son doesn't need it in his life either. He calls me everyday with this carefree additude that he's getting better now telling me that he promises he's done and all he wants is to save our marriage. I honestly don't believe I could ever trust him again and I tell him this but can only do so to an extent because I don't want to say anything that could harm his recovery process. With everything that is going on right now, I have also been unemployed since November of 2009 receiving unemployment. I don't even know what to do and to make problems even worse my car is in his name. What do I do, any advise from someone who has been threw this would be greatlt appreciated ?????