Hi Nitabug and welcome. Glad your found SR, there is lots of information here that is helpful.
To answer your question, no you can't help him really. That's the truth. The 3 Cs - You didn't cause it, you can't control it, you can't cure it.
I wonder how much you know about alcoholism? Please know that in no way is that meant to be judgmental, it's not like it's something we are taught in school! But when you are dealing with someone who is an alcoholic it is incredibly important to understand, or try to understand (hard to fully understand when you aren't actually an alcoholic).
Please take time to read around the forum, there is tons of information here, you might want to read the
stickies at the top of the forums as well.
https://www.soberrecovery.com/forums...find-them.html (What is a sticky post and where do I find them?)
A week in you found out he is an alcoholic and gave him an ultimatum. Your third date was spent at the ICU with him in withdrawal.
Two months later he is drinking again. He's not in any kind of recovery and he obviously doesn't want to stop drinking right now. It's easy to think that HE has a problem with drinking, in fact YOU have a problem with his drinking. Really you are going to have to accept him as he is. If you are prepared to be in a relationship with an alcoholic, that is your choice, of course, just please research so that you can have some understanding of what that entails.
Nothing you say is going to make him quit, that has to be his decision.