Brother moving in with GF pt2

So after trying to fight for his decision to move with his girlfriend, my brother decided the next day to break it off. He got cold feet. And his ex contacted me through social media trying to make sense of it. We’ve never met or talked through those 7 years she’s been with him. My heart breaks for her and even crying because I know that my brother led her on for some time and he now sees the affect so he feels like a monster. But she also knew deep down that his stalling meant he didn’t love her enough. I don’t want to be in the middle of this, but it has affected me emotionally mostly for her. She knows exactly what my mom thinks of her (because she mentioned them to me) my brother can be really dense. Because it’s horrific, that part got to me the most. Because she doesn’t deserve it. My brother has had other girls in the past and my reaction was always whatever, but this time it feels like I broke up from a relationship. Heartbreak sucks and I hope my brother learns from this not to lead others on!