Hi Brune and welcome to sr. I had this with my ex also, not the near beer, but in the beginning of our relationship, he would get nasty only when drinking, but later turned into nasty when drinking or when not drinking. I was married 27 years.
Sometimes in the beginning I felt the nastiness when he wasn't drinking was bc he wanted to drink, but he would drink and then be nasty. He eventually turned out to be just "nasty at least 320 days out of the year, if not more, whether drinking or not.
You're not married. Look at long term.
He may have stopped drinking, he may have not. But what is he doing for himself?