I haven't bothered talking to him about his drinking. Once was enough - he knows what I think and he doesn't agree, surprise surprise! Now he's my ex, so it's really not my business anyway. I think that the last person to be able to make them see the light is their significant other. I've often hoped that one of his friends would say something but it hasn't happened as far as I know. Shame because he might feel less pressure from a friend.