How to break up nicely?

We’ve been dating for almost a year. He has addiction problems that he needs to work on. I’m unhappy because of these addictions. He’s the sweetest person but once he indulges it’s not the same person and I can’t take it anymore. I’ve told him a few times to get help, he was mad. He tried to stop on his own and he was doing well, but his friends all do these things and he went back to it.

I want a guy who will be there for me and not be hungover or too drunk to drive or driving drunk. Anything upsets him he turns straight to the bottle. He’s literally left me for the bottle before and I had enough. How do I put this in a nice way and finally end it?

How to break up nicely?
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