How do I begin life as a single mom? / husband with an addiction

I'll start from the begining. When I met my husband we talked about things we wanted out of life and the lifestyle we want to live. Our life goals matched perfectly. The ultimate one being one day when we are old n grey, to sit at the head of our table and see all children, grand children and great grand children that we created. To "break the cycle". (My husband and I both come from really screwed up and drug addicted familys). During our life together we completely cut ties with our families and any person who had drugs in their life. While I have been a stay at home for the past 6 yrs. My husband worked for the drug and alcohol commission as a counselor. Then after having more children the pay wasn't enough. So he got a construction job. Then after awhile he had a legitimate injury at work. Started getting pain pills from the doc. Then they weren't enough he eventually turned to heroin. I made him go to the hospital to get clean. He did. Came home. Was clean for awhile but then slipped back into it. That happened again and again with other rehabs etc. He won't tell me the truth about anything I have to pull it out of him. N it's not like I even come at him all crazy I'm calm cool n ready for any craziness he will say. N come at the situation like "Let me help you". Our financial situation because of all of this is at the point that the cars are getting repossessed and our home is getting sold because we can't pay $1300 in taxes. I have reached to the point that I am done n feel like I'm a bad mom for staying. So I'm ready to go start a life with just me n the kids. My question to the community is:

how do i start life on my own with absolutely no help from family or friends? If I tell the government assistance place my situation will they arrest my husband or take my kids? I just want a smoothe break off. N leave him to tear down his own life. I don't want to be responsible for any bad things that come his way.