Hi Gotta,
Mmmm, sounded like me and my son. Know how you are feeling. OK he left, leave it be. Dont try to call him and when he comes home ask him to find somewhere else to live even if he is going to jail. Tell him you will always love him and be a friend to him but nothing else to pay for his lifestyle. Yep, they use you and everyone around them. Poor me crap, anything to get what they really want. I went through this madness for years and did I learn the hard way. Love got in the way, he smashed windows, police turning up, you name it! I just had enough and knew I couldnt do anything to change him. The last window he smashed was the last time he lived at home. He was never to come to our home again if he was using.
When I stopped giving him what he needed, he stopped asking me. He got help and is now doing a certificate in 'Youth work' to help people like him.
Keep strong, I know its horrible but sanity is just around the corner if you want it.