What's needed here is BALANCE. Yes, you want to let go of worry and fretting--it makes you feel crappy and does nothing to help the situation. OTOH, you have to keep your eyes OPEN to REALITY--as it is, not as you wish it to be. That means taking deep breaths and assessing the situation as objectively as you can.
The fact is that in all likelihood, he isn't going to be ready to change just because you've decided his drinking is unacceptable to you. It's fine to be hopeful, but hope isn't a plan. Any good plan starts from the probability things will go a certain way. The probability is that he will continue to drink. So I'd suggest PLANNING for life on your own, given your expressed determination not to have an ongoing relationship with an active alcoholic.