I see that he has a problem with alcohol, but he does not want to admit it and refuses to go to rehab.
It seems to me that if he does not see this problem, then it is unrealistic to help him. I'm sorry, but it's true.
Look, I still think that if you care about this person, you should do your best. Read something about how to convince a person to go into rehab. Convince him that there are more advantages in this, as Abbeycare advise on the practicalities of facilitating a rehab admission. Well, it is not wise to refuse rehabilitation.
