I slapped my girlfriend and feel horrible about it?

I quit a new job because of mental health issues. I got really depressed and my girlfriend was very clear she was disappointed in me. I locked myself away in the room because of my guilting was emotionally unstable. She came into the room to try and get me to tell my family because I hadn’t told them yet. I told her I’d tell them later but she wasn’t having it. She tried taking my phone away from me to call them and force me to tell them. She kept saying that the longer I wait the worse it would get. I tried telling her that I couldn’t handle more disappointment than I was already getting and that my family wasn’t like that. I don’t remember exactly what happened but I slapped her. I felt immediately guilty and tried apologizing but she just silently left. This was several months ago now and I’m going to therapy and am on medication. She told a lot of people that I hit her afterwards and she keeps bringing it up and saying she’s scared I’ll do it again. That was the first and only time I’ve hit her I never want to do it again. I just don’t know how to begin to try to get her to forgive me.
I slapped my girlfriend and feel horrible about it?
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