I am afraid for my friend.
So, for context, I (F20) have been friends with this one girl (F20) since we were little, we lost contact over the years and eventually began hanging out together when we were in our late teens (17-19 years old). We attend the same university, then got very close but proceeded to have a little "fight", the reason for it being my *very* busy schedule and her discontentment since I couldn't hang out much anymore. After that we kind of parted ways, she has work/college and I have to study until my brain is fried. We both got upset over our discussion, but we know not to take things with such a heavy-heart and every time we see eachother in person we chat a bit. So our relationship is ok, not as deep as before but yeah.
Well, recently I found out she started dating one of her friends, and specifically, the one who hates my guts (I called him out when he deserved so). You see, that wouldn't really be my problem, she is an adult and she can decide who she dates, regardless of their past actions. My issue is that I know what he does to his partners. This dude is known to be very controlling and demanding, he has said harsh things to his past girlfriends and overall enjoys treating others like crap.
Oh, but it gets worse: this piece of sh*t pathetic excuse of a man records (with no consent whatsoever) his romantic and sexual partners during intimacy. He then sends the videos to his groupchat, so that his buddies can see him having sex with those poor girls who have no idea they were recorded. How do I know of this? From a girl that is in his class, she happened to also be recorded when they hooked up and was informed by her friend (also his friend) of the situation regarding her and others. As far as we are all aware though, none of the videos got leaked outside of that groupchat (not that it makes it better).
I am horrified and afraid for my friend. She is a good person but tends to be naive when it comes to (shitty, specifically) men. She knows I don't like her boyfriend as a person, she knows we had previous discussions. I want to tell her about this, warn her at least, but I am so so so scared she will think I am being an asshole and a hater. I am also unsure of what her bf would do if he knew I told her. Even though we are not the bestest of friends anymore I still care about her (more than I would like). Please, I just want her to be safe.
Any advices are welcome here, as I have no idea as what to do.