He will maintain the lie for as long as he thinks he can get away with it. When you call him on the lie, he will act like it is your fault that he lied. He does not live with you. You are done helping him. If I were him, I would be #$$%$$ off that you kicked me out, told me you were done, and then continued to meddle in my life. This is how they think. If you are done, truly done, be done with it. Let the boy grow up. What that looks like is up to him. If he choses to do it in a way that you do not approve of...oh well. it is not a reflection on you. You did not fail. He failed. That was his choice. He is not so disabled that he does not know right from wrong. He would never agree to live the way MWM's Sonic does. Sonic had to be open to it.