I am sorry to hear about his addiction to such drug, just as I feared and commented in previous message. As your story shows, here the core issues of denial, avoidance, repression, rationalization and more seems to be deeply undermining his ability to face reality, cope and take good care of himself. As you concurred, there is no way he could truly start and get well into his rehabilitation process from all these disorders, unless he acknowledge the seriousness of his situation, and takes full responsibility for his choices and actions, committing to work on himself with necessary Expert support. He requires what we know as dual diagnosis treatment, once he has an addiction problem plus depression, anxiety and for any other mental health problem he may suffer, including personality issues.It seems obvious to me that treatment should be intensive, and most times in scenarios like this, due to the addiction issues, inpatient programs rather than outpatient become the best and realistic option for him.He would have to get Expert support to get detoxified first, in order to be able to work on himself with regular psychotherapeutic support. It would be a multidisciplinary team of Experts who would assist him, but again, as explained before, without him coming to terms with the fact that he requires to work on himself at the mental and emotional levels, in order to take then consistent actions and literally transform his life style, he would not be able to get better, nor rehabilitate from any of these serious conditions. Your role would be of providing assertive support, of promoting his awareness of reality and accountability for his own process, confronting nay unhealthy or dysfunctional thinking pattern. Any person around him playing a codependent role would only fuel and enable his disorders and the illusions they create even more, thus such is the last approach you would like to have in this situation. Obviously being assertive would be something he would not like, he would negatively react, becoming defensive, and pushing you away, but that is a consequence you would have to afford if what you truly want is to be supportive and offer something healthy that could promote his awareness and responsibility. If he has nobody truly supporting him already, then you would be the only one bringing some light into reality in his life. Secrecy would be one more codependent pattern that would not help but deepen his dysfunctions. His request for you not to tell anybody about it shows he is not truly willing to start doing what he needs to do to start his rehabilitation process. This is very sad and frustrating but real. This is also a main reason why I said before that you need to assess what you are truly willing to afford or not in this situation, once the issues and challenges are many and very serious too. Finally, my suggestions are for him to get dual-diagnosis intensive inpatient treatment after completing detox program; then he would need to commit to an IOP - intensive outpatient program, followed by regular individual psychotherapy and attendance to adequate support groups. During intensive treatment he should receive individual, group and family psychotherapy for these treatments to be effective, once his dysfunctions-addictions are not isolated from reality, but part pf a whole reality where people around him have played in different ways, more or less codependent roles fueling his addiction-disorders. You can only be absolutely honest and open towards him, providing unconditional "healthy" affection and insight, without including any form of codependent influence, which is what he'd look for, since that would be the worst way not to support him, but to undermine his reality, fueling his illusions even more. You can and should only do what depends on you, as a fully responsible adult, while he needs to do the same, and nobody can or should try to do this for him.