Can I get custody restraining orders against an abusive ex and his coworker with whom he was cheating with on the day of the assault?

My son’s father had mentioned a female co-worker that he put on a pedestal while verbally attacking me which made me suspicious: He was missing for hours without communication. He started to tell me lies about little objects that I found. Then when I questioned him, he threw things at me and and shoved me. I did not call the police: Days later, he refused to answer more questions and left me and my son. The other day, He was driving her car and realized he’s locked out of our home. I don’t want my son with him and this woman since he turned nasty to me and assaulted me when he started seeing her. Can I get custody and a restraining order against both him and her? They are both teachers and I did not file a police report yet.