In my most recent experience, she went with the "I'm offended" approach, followed by "if you really think I would do that then don't talk to me", followed by the truth told in a way that was really twisted up to try to make her not the bad guy. Then not a peep since. It was kind of amusing. Sort of like when a little kid lies and comes up with off the wall explanations as to why he's not lying. I feel sorry for her boyfriend though, holy shit.