I can't stop being so concerned about my friends...

My best friend has been in the most horrible relationship everyone has ever seen. Her boyfriend is abusive, and treats her badly. I've been shaky and on edge and having horrible flashbacks because I can feel she's gonna be hurt. I want to get her away so badly I would practically just pick her up and leave with her if I could. I feel this way about a lot of my other friends too. I just want to protect them all soooo bad. I just want her to be safe, and I just want my other friend to be safe too. I know I can't always be there to protect them, but I just can't help it. Please just keep them safe. That's all I ever want from now on.