The choices we make each day determine the consequences we live with. Even though you say you don't want to live this way, you do. No doubt, growing up in a home where Dad mistreats Mom is a large part of the problem. Not to say everything is your parent's fault, either. Probably they were just living the same way they were raised. We all do it to one degree or another.
The good thing is that you recognize that the way you are being treated is wrong. You have made a step in the right direction by calling the cops. It's against the law for people to beat each other up! You have a right to expect that your boyfriend pay the consequences for his behavior. You have a right not to suffer for his consequences. But you know what? We teach people how to treat us, and you have taught your boyfriend that you will tolerate his addiction and his abuse.
The only way to stop suffering the consequences of HIS drinking is to choose not to do it anymore. You are a creation of God. You weren't intended to be another person's punching bag. God loves you and wants you to make choices that are healthy for you. He wants you to have a good life. But He gave us free will. We can choose to do whatever we want to do, inspite of His wishes.
You already know that you need to be without the chaos that your boyfriend brings with him. You already know that you want to be safe. Ask God to help you be strong enough to do the right thing. He works through people here on earth. Take advantage of the help that is available to you. It takes courage and hard work, but you are worth it!!
Decide that you are worthy of love and respect just because God made you! You get to choose now that you are an adult. When you were a child, the choices were made for you. Or you just had to suffer the consequences of other people's actions. But you don't anymore. You get to choose for yourself.
I pray that you will be strong and choose to be happy and healthy.
SJW