Do you suggest I still just leave him? Even if he was to actively seek help?
Absolutely! Living a sober life is a life-time commitment. The chances of relapse are very strong unless he is truly committed and willing to work every day for the rest of his life to protect his sobriety.
Do you honestly believe he is willing and will continue to be willing to do that? What if you go back and after a few months or a year or two, he goes back to drinking, which is a distinct possibility? You will be right back where you are now, but will have wasted all that time.
You deserve so much better. There is someone out there who will treat you the way you deserve to be treated, but you'll never meet him as long as you keep holding on to this guy.