Domestic violence

My sons father has always been handsy and verbally abusive. I thought things were getting better until yesterday we decided to go out and he hit me in front of a bar full of people just because he thought the look on my face was inviting people to talk to me. ( he was also being verbally abusive so of course there wasn’t a smile on my face) . He was put out of the place and I asked for a report because I wanted to get a protective order because it really freaked me out that he would do that in front of so many people. The police told me that even if I didn’t want to press charges the DA has picked up the case. ( I have multiple reports against him but have never pressed charges) he was taken to jail and has been there for the past day and half. Part of me feels bad for this and I don’t know why. I don’t want things to get worse for him because I’m afraid it will be worse for my son and I. Idk what to do and how to feel. Any words or advice ?