So your "girlfriend" goes to a party without you, gets hammered, goes to some dudes house, supposedly gets felt up and leaves immediately leaves (probably not) and now wishes you had been there to prevent all of this?
Let me break it down for you since you can't seem to comprehend what happened.
Your almost girlfriend went to a party without you because she wanted to leave her options open, she tried a new option/options (hehe) and they turned out to not be as good as she thought. Now she wishes she would have brought you because it would have prevented the embarrassment of banging a dude/dudes that weren't all that great.
Your welcome.