Dating a drunk

Hannah
I've been with my fiance for a little over a year now and I'm beginning to become discouraged he's an alcoholic and he constantly says he is done with alcohol but almost every time he goes on a walk he comes back with either a pint or a half pint of vodka he gets drunk almost on a daily basis and when I confront him about being drunk he gets mad and tells me he's just tired but I'm beginning to know when he is drunk he starts talking nonsensical things like today he was going on about someone wanting to chop his head off and then he told me that I wanted to chop his head off. He's on several occasions more when he's been drinking than any other time broken up with me told me to get out of his house/ his life I'm starting to be at my wits end I need advice please and no bashing