OK, I've been dating this girl for about two years now, and she's amazing. We have so much fun together. I also have a lot of fun with my best friend, who I've known forever. However, another close friend of mine has told me that the two of them slept together. Now, he has been spending a lot of time with her more recently, but she still treats me the same way, and I'd hate to bark up the wrong tree-- or any tree at all, really. Should I confront them about it?