Baby daddy troubles

I(23m) recently met this girl(24f), and it’s been going really great. We been texting all the time and talk on the phone before going to bed. She has two kids so it been harder to hang out in person. She doesn’t want to introduce me yet as it’s too early, which I understand. She has taken on the role of having full custody and the baby daddy sees the kids one every month just about.(his choice) They haven’t been to court at all in dealing with custody or child support. Her baby daddy was supposed to take the kids today, and we were gonna go on a walk and grab some food today. But we she dropped him off, her son said something about a guy and he lost his shit. He threaten her saying if there was another guy and was going to do about of stuff to her house and what not. Then he proceed to scream and cuss at her. It ruined her day and she called me sobbing and saying she just wanted to go take a nap instead. So we didn’t hang out and when I asked if this was a regular occurrence she said yes. I ask why she hasn’t gone to court or the police about this stuff and I couldn’t get a straight answer. She says she is scared of what his repercussions would be. I really like this girl and she says she really likes me too but then she says I don’t deserve to put through all of this. That everyone would be happy if she was alone. I try to convince that she’s allowed to live her life too and I want to at least give us a try because we both really have been enjoying each other and the conversations. But she allowing the guy to control her life. There’s really nothing I can do which really sucks. What advice would you give me in this situation?