I dunno. He's just... he's been verbally and emotionally abusive to her on many many occasions (once physically as well).
She isn't brainless, far from it, she's quite intelligent; but she's one of those people who's emotions run very deep? She's kind of emotionally fragile, and despite claims of being "done this time"... well, she has claimed that she has been "done this time" with him about five or six times before.
I dunno. She has messaged my girlfriend in the past when things got rough with her and I, and it helped somewhat. I just figured a simple push of "hey man... if you don't treat my friend better, things will happen, things that you won't like" may have been productive.
I mean, this has happened at least four or five times and at her request I haven't messaged. This time I relented also. I gave her fair warning though, that whether they are together or not, if it happens with him literally even one more time, I am messaging him. I gave very fair warning.