Dad--Son's mother tells me she was harmed by her boyfriend

I hope I am posting in the correct subreddit. Created a new account for this post.Like the title says, my 4yo's mom has a boyfriend that thinks she is pregnant, even after he forced her to have an abortion. He came to her house (son's mom and I are separated) after work and she claims that he "pressed on her stomach" which she claims caused her pain.My question(s): As a western-PA single father, what are my options? She refuses to call the police as she now claims that it was "no big deal" and that she wants to see if the guy will be different tonight after work.2 weeks ago, the same dude supposedly grabbed her face in order to yell in her face. via /r/Parenting http://ift.tt/2xwDu7c