First of all, Its good to know that you are aware about your problem, and that you believe and accept that you are addicted to alcohol and a substance like weed. So you have already taken a step towards having a substance free future. Although it appears that you did put efforts of leaving the substance behind, but couldn’t stop yourself from discontinuing. I can understand that it is difficult to quit, but not impossible. Therefore, I would suggest that you first need to take some help from a trained professional, either a psychiatrist or a clinical psychologist who specializes in de-addiction, so that a relapse can be avoided, and you can successfully manage, control and cope with the addiction related issues.
As you mentioned before, there has been breach of trust several times in the past, because of which the relationship hit the lows, so I would suggest that you put energy on developing and emerging as a healthy, addiction-free individual- the one she loves and you love, so that you can find solutions to win her trust back.
There are a list of trained psychologists available in the therapist directory of the hopenetwork.in, who can help you start your journey towards deaddiction. Incase of further guidance, counselling and psychotherapy sessions, feel free to approach.
Clinical Psychologist- Hopenetwork.in