Should I just not help them any more

omg im so pissed!!! okay! 2 of my friends have been going out for about 2 years already. ITs been off and on and he gets angry real fast and sometimes abuses her. My friends and I were supporting them for a long time. They always say that they have broken up for good, but then 1 week later we find out they’re back together. AND this week they brook up again and she said that “I CANT LET HIM BACK INTO MY HEART”, the next day THEY GOT BACK TOGETHER. My other friends and I were hoping that THIS WAS GONNA BE IT, OVER FOR SURE! It hurts me that we are always there but it seems like they ignore what we say. So what should I do?! Should I just not help them any more because I lost faith in them. IM HATING FOR WHAT THEY ARE DOING, but yett still love them. I don’t know WHAT I SHOULD DO!? HELP! any advice on this, please??