He is drinking out if distress and a feeling of not being understood .
Develop Empathy , Respect and active listening towards his words .
Empathy is to sitting in his place and understanding his feelings .
Active listening is listening without being mentally preoccupied with certain opinions towards him .
He also needs to work on his self development skills .
Behaviour therapy
Working on his self esteem
Building more self control .
You can always seek professional help .
Next Steps
Make a chart to monitor his drinking.
chart should include-
event that triggered drinking,
amount consumed each time
time gap between two drinks .
This will help to understand his craving pathway .
Also develop Empathy , Active listening and seek counseling.
Health Tips
Engage him in his hobbies , reading self educating books , exercise .