ETA: You're asking the wrong question. Please don't make your son the scapegoat. It's true that he needs help to change his behavior, but truly ask yourself why he might be doing some of the things he does. Look at the big picture.
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Get in touch with your son's psychologist and/or pediatrician to get referrals to places that can give him more intensive help. BUT---- don't just send him away to a place and expect them to "fix" him and send him right back into the environment that fostered these behaviors.
This next part, G., I'm saying with concern and genuine caring.
While your son is getting treatment (whether that is inpatient or more intensive outpatient), YOU have to take responsibility to for your part in this family dynamic where your son's behaviors developed. (I'm not relieving him of his responsibility; he will learn about that in his therapy, but now I'm talking to your role). You must get your family situation sorted out. Just based on your past posts with all the turmoil with the boyfriend for all these years, it could not have been a healthy environment for any family member, let alone a young boy who has since grown into a teen (you've been with your boyfriend for over six years, so your son was around age 8 when boyfriend came into your lives).
From the posts you've written in the past, your boyfriend, with whom you and your son live, does not live up to the role and responsibilities required of someone who is in a long-term, live-in relationship with someone with a child. He's just a warm body for you, but in no way has he stepped up to be a role model and a healthy ally for your son. Why do you keep allowing this? Do you not see how this affects your son?
You have just a few short years before your son is a legal adult and out of your direct control. Please don't abdicate your parental responsibility for the sake of a man who appears to care nothing for your son. Get into counseling yourself and find the strength to make these last four years with your son a time of healing and growing your mother-son relationship. It's really seemed to have taken a beating these last few years. Therapy will also help you learn to value yourself more so that you don't put up with people who are not worthy of you.
I truly wish you and your son the best. I hope you both get the help you need to heal so that you have a strong relationship as he heads into adulthood.