Dating

My boyfriend is getting into substance abuse how do I help him stop or at least get it in control?

My boyfriend (17) and me (18) have been dating for a year. He recently started doing weed and smoking due to stress. His entire friend group is the same and it looks like my boyfriend is getting influenced pretty easily. Recently a lot of stuff has been happening regarding his family and its some pretty serious stuff which is why he has been depressed and really stressed too. And ever since then he has started doing even more stuff after me repeatedly asking him to stop.
I hate all of these things from the bottom of my heart due to my past issues and some that went on w him but that never actually made him stop.
He has been smoking weed non stop and recently tried gummies two days in a row and drank and smoked some more weed the same day. When I brought up how bad this is for him he took it as a personal attack and thought I was asking him to stop bcs I hate those things which is partially true but the major reason for me to ask him to stop was bcs this is really bad for his health. He says he's not addicted but it looks like he is and him using these things as a coping mechanism is so much worse.
When he told me he was really really sad and struggling I asked him to let his parents know and maybe see a therapist instead of doing substance abuse. He got upset because he thinks instead of me helping him and supporting him through this im lecturing him about how bad it is for him. He said he knows its bad and that he shouldn't use it as an escape but still wants me to support him (maybe so he doesn't feel guilty ab doing it and doesn't have to deal with me giving him shit over it). As for me I think he shouldn't go down the wrong path while he's already going through something really difficult because its gonna make things worse for him. He has been more demotivated and depressed and low on energy ever since he started doing all this.
Now I js dont have any other choice but support him, but I just know that me supporting him do this is not right at all.

My boyfriend is getting into substance abuse how do I help him stop or at least get it in control?
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