When is enough, enough?

Hello. I don’t know how to explain everything that’s been going on between my husband and I. Things have not been good for just over a year now. We have been married for two years and together for four. Known each other for six. Lately things are getting more intensely uncomfortable. The arguments that are happening are bad. He is usually drunk. He will say extremely hurtful things and act like everything is okay the next day. I can’t let it go though. I’m constantly reminded of the things he’s said and he does not really hear me out when I bring it up. He has completely denied things he’s said before. Also said I’m bad too because I’ve been mean as well. But the thing is I’ve never gone as far as he had and I still remember the next day and do not deny things happened. I don’t want to get into specifics but I’m crying every day wondering if there really is better out there? Even just to be single. I feel trapped. We have no shared children but I would lose a step child which would hurt me a lot. But I don’t know if I can continue forward. We have history but is it worth throwing away to be happy?