Dear Lord, sounded just as the last hundred or so times for my ABF and I over 18 years. I had said "this is the last time etc" so often and little result. Last time I didn't say it. I told him I was stepping away for my sake and his, that I had done no good in the past and in fact realised that my "loving caring" was just enabling the hell to continue. If he needed help he knew the ropes better than I did, and it was up to him to get it. Stayed with him while he went thru withdrawal, (read a book mostly) in case he needed ambulance, then when he was done, albeit looking like death warmed up, I went home.
He has been to D & A counseling and is sober still. Maybe this time will be it for him.