You're fooling yourself and he's playing you.
The best thing you can do for your brother is let him get busted and go to jail or rehab. You can't save him, you can't help him, and you are not safe so long as he is there. He will steal you blind, his friends will steal you blind. He'll endanger you and your family, all the while begging for your help and understanding.
The only person that can help him is him. No matter how many times you 'save' him, no matter how many nights you lay awake and worry and cry, no matter what you do, it won't change a thing. Let him go and save yourself. Go to NA yourself, for yourself. It will help you let go of him. You need to learn that it's not your fault and it's not your responsibility.
Or you can spend your whole life picking up after him, paying for his mistakes, dragging him home and cleaning him up, pretending that everything's gonna be ok.
Those are your choices. Period. Been there, done that.