We’re both 20. She’s bi and she has plenty of friends, both male and female. I don’t worry about anyone except one of her guy friends. 

He insulted her a bunch of times, then called her beautiful and tried to hook up with her when they were both drunk. When she said no, he followed her out of the building, and had to get stopped by security. She tells me he’s nicer now but I can tell he’s just putting on a “nice” persona so he can get in her pants. I don’t wanna seem insecure or jealous but this makes me worry a lot. I worry about her safety, and I worry that she’s just keeping him around for validation/as a backup plan.

Should I talk to her about this?