I am still feeling a bit guilty about the whole thing
You shouldn't.
People who do what he's done can't expect any person with half a brain cell to stay in a relationship with them. He's been so physically aggressive/violent towards a partner within a relatively short time scale that neighbours have called the police - twice now - because they were so disturbed by what they were hearing.
And you say you moved away from family and friends and made sacrifices to move to be with him - such gratitude and consideration, leaving you in this position.
On the drinking side of things (for you) .. this guy is capable of being violent during "arguments" (esp. those with drink). A decent guy will not be violent towards you if you are drinking, talking shite, arguing, whatever ... But a decent guy will also not stick around for more. He may give you a couple of chances but he'll end it if he's dealing with a drinker, esp. a lairy drinker (if you are one).
So, while finding a good, steady partner/relationship is not the only thing in life, it is important for most people ... and to give yourself a chance of a good relationship in future, you need to solve the drinking. Even if it means going tee totalb- that's what it takes for some people.
My sister progressed from heavy social drinking to alcohol dependence/abuse during a very shitty relationship. By the time she was divorced and looking for a new partner, it was obvious to anyone that she was alcohol dependent. And most men run a mile. Any chance she had of meeting and making it work with a well adjusted, stable, good potential partner seems to be scuppered. It was especially the case because she was about 41, and looking in her age group (and maybe a bit older) and by that age people aren't naive and idealistic like they are in their 20s (and 30s to some extent) they are experienced, jafed, and they've seen it all before. So they aren't investing in a relationship with a drunk woman who's slumped over her wine, getting emotional and maudlin, getting repetitive, picking fights etc. (not saying you do that, I'm just picturing alcohol dependent women I know).
My sister ended up with another drinker because a non (heavy) drinker in their ,40s or 50s isn't touching that shit with a barge pole. He enables her drinking, pours her drinks and she has become a much more severe alcoholic in the time they've been together, she looks gaunt and her behaviour (and memory) is worse than its ever been (drunken calls to family, recriminations, paranoia, not picking, fallouts, ostracism followed by reaching out, crying about being raped during the calls (yes, we only fully found out about it recently) on and on. I've suggested she goes for no residential counselling in our local rehab centre as she wouldn't countenance residential, she had not done it. She tries to reduce her alcohol intake but if creeps back up.. she physically (and behaviour wise) seems to be moving towards the later stages of alcoholism and it looks bleak.
Don't become like her.