Well you can tell hes trying, but he needs cut his friends off really.. for now anyway..
Most of my mates wont give me any nums anymore because i tell them not to.
I understand as well because its been 15 years. My gf is the same. But she has had it with me a few times anyway. She gets my phone and car keys off me at 5pm fri and sat nights lol.
He prob is a real good dad and bf. But this stuff is like a slippery snake and effects people differently, and the come downs are awful. Just keep what you are doing if you are staying with him. But if hes not willing to change or gets worse, start thinking of your self