I Hate Abusive Fathers

I have a regret that I have told no one about..and it's that I couldn't help a girl who used to get abused badly because I chose to remain silent. when I was 11 I went to stay at my aunts in summer and I used to go to a women who babysat me and other kids. I got along with this one girl who was my age however I noticed that she had bruises she didn't like to talk about her family and she always got scared n hate it when her dad came to pick her up. Around my last week she stopped coming so I went to visit her to check on her for the first time she opened the door and literally broke down in front of me crying all of a sudden she told me that her father hits her throws stuff at her calls her names locks her in her room n breaks her stuff even when she did nothing wrong since her mom died she told me to not tell anyone when I grabbed my phone panicking so I did like what she told me left her house and acted like nothing happened that last week passed quickly I returned back home without helping her or at least knowing her phone number. Now at the age of 13 remembering this makes me cry my eyes out for being pathetic person....Now I protect and stand up for everyone in need even if I end up getting hurt or in trouble for it I can't get over this no matter how much I try...Dear you plz help everyone u know who gets abused or bullied....cause believe me they are going through hill and shit...