you have learned to communicate ? who’s talking back then ? not him clearly. snooping is not communicating is it ?
The biggest part of communication is listening. You are trying to read something that can never be understood, you think you know but you cannot ever know, you are not supposed to know – you will never know

Listen to yourself, and if you like to learn as you say you do then listen to yourself and know what you are telling you.

the biggest learning curve will be from how well you can listen to you and what you can learn from you

No matter how much you think you know or could learn you will never be in control of him or his addiction. you can only ever be in control of yourself