How do I get out of an abusive relationship if I have absolutely no job?

I think I’m in a start of an abusive relationship. I know it’s emotionally abusive but last night he did something I never thought he would do, he punched me in the face. I got up to make a bottle at 2am for our 9 month old, when I got back in the room I threw the bottle on the bed next to my fiancé, i know it sounds weird but I was giving it to him to feed our son so I could turn the lights off and I was just to lazy to walk all the way across the room lol. I honestly didn’t think it would piss him off so bad he jumped out of bed and punched me in the face (YES THIS IS THE FULL STORY) I was literally so shocked I just stood there.. then he drove off and didn’t even see how I was doing or said sorry. He blamed it on me for throwing the bottle at him. Like so that justifies for what you did? NOT TO MENTION MY BIRTHDAY IS TODAY. But anyways I want to break up with him so bad, but I don’t have a job. I’ve been the one staying home with our son since he was born so he has all the money. I know I need to get out of this, but I have to be able to buy my son diapers and put a rough over his head. I dropped out of high school when I had him so I don’t even have a Diploma. I’m so scared..