Ex/baby daddy in jail

I was with my ex for 4 years and we had put together a year ago. We broke up around October and recently found out he’s been arrested for domestic violence and the girl died. Also turns out he was cheating on me with her. Anyways I had to go talk to the cops and when going over everything revealed that he had slapped me twice in the face while I was pregnant so they charged against him for that. Now I feel guilty anyway I can get the charges dropped??