hello nic. welcome to the forum. sorry for what brings you here, but glad you are here.
i find myself wondering if you are his lover or his parole officer. just wondering. . .
by the time i married in 1980, i had participated in enough psychotherapy to avoid marrying a substance abuser, but not enough to avoid raising one. today the substance abuser i raised is 44 and homeless. i am grateful to say he has no children of his own. i resumed intensive therapy in the late 80's when he began showing the abuser patterns i knew painfully well from my childhood. the question of roles came up often during that therapy. when was i mothering and when was i policing? the difference is substantial. these days i figure my job is not to understand him. my job is to love him until he understands himself and to hope healing happens here.
this question comes up often with the love of my life (still married), as well. he is a very sober man, but when the stresses of life have us sniping at one another, my personal inventory of my own behavior often reveals places where i am trying to control him. we don't GET to control other people, not even the love of my life.
just sharing personal experience. every case is unique, especially in matters of the heart.
steadying support while you find your own path. welcome aboard.