There's an old saying (not sure if anyone has posted it yet) which perhaps SSG can relate to:
"A slut is a woman who will sleep with any guy. A bitch is a woman who will sleep with any guy BUT YOU."
If she had done nothing, he would probably be joking about how 'easy' she was. As it happens, things didn't turn out that way. So now she's the bad person.
You want helpful advice? Be a man. If you end up at the club with your girlfriend (assuming you decide that going to the club can't possibly be a bad plan) at the wrong time and this other woman confronts you, deal with it. If it doesn't go according to plan and your girlfriend dumps you, then such is life. Consider yourself as having learned a valuable lesson.

