It's not on you AT ALL. It's on your friend. Unless her safety is at issue, it's not your job to babysit. When it comes to that stuff, I couldn't care less what my buds do when we go out.<quoted text>She knew the relationship would end sooner or later because they just weren't going in the same direction. So I think what happened is a symptom of underlying issues - nothing terrible, but just knowing that they weren't right for each other.
Her boyfriend broke up with her. She denied doing anything with another guy and told him she slept on my couch, but either he or one of his friends saw us downtown because he described the other guy's shirt. Like I said, nothing overtly WRONG happened in front of me, but I guess he put two and two together.
Her boyfriend also told her she should consider making new friends because it's not cool that I let her "flirt" with another guy knowing she's in a relationship. That stung. But she told him to leave me out of it and that I'm not responsible for anything between them.
I truly had no idea anything bad was going to happen until the elevator doors closed in my face. That's where the naivety comes in and I need to get better about that.
I know shes your friend, but good for him for dumping her. I would have done the same. Whether she actually slept with him or not is immaterial. You can't be with a woman who walks all over you.