I have to agree that HE needs to control HIS issues, and allow you the space, time and comfort to deal with yours. He didnt turn this way the day he met you, and therefore shouldnt consider it a "relationship" issue. its a HIM issue and he needs the privacy and security of working on HIM and only him with a counselor that he isnt sharing. its about fixing him, which may or may not fix your relationship. Either way he has to stop being so self destructive.
Im so proud of you!