Marriage problems

Me and my husband have been married a little over a year, together for 7. We have 2 wonderful kids. The problem is he’s an alcoholic, he works and pays the bills but idk it bothers me. When I bring it up we get into really big arguments, he thinks since he pays the bills it doesn’t matter. He talks to me so mean when we argue and tells me to get tf out when he knows me and our kids would have no where to go. We got into an argument a week ago and I made him leave to spend time apart because he was scaring our 4 year old. The thing is usually when he leaves he begs me to come back and acts like he’s gonna change and wants our family but this time it’s different. He hasn’t asked to come back home and hasn’t really talked to me a whole lot other than about the kids. I cant help but to think he has someone else, the arguments really started a couple months ago when I would bring it up. Before he would try to understand and not fight about it. I’m just not sure what to do