So, I'm in the kitchen making myself some coffee the other morning when she comes out holding a sexy pair of underwear.

"What's this?" she demands, to which I answer, "Those aren't yours? I guess I'll put them in my random women underwear drawer."

Well, I guess that didn't go over so well, and now she wants me to apologize for humiliating her. Not sure where the humiliation comes from, though, since we've never had any discussion about being exclusive...

Any suggestions for my conversation with her later?

[Update]

So, I had a chat with her a bit ago and after listening to her rant about how upset she was, I told her that I am sorry she found the underwear... but I'm not sorry for sleeping with other women, and there was no expectation of exclusivity in our relationship.

Guys, it was awesome... she tried every trick in the book to get me to commit to an exclusive relationship with her right there on the spot. Anger, sadness, disappointment, you name it... I maintained frame and told her that I'm not going to be exclusive with anyone, and that she can move on if she isn't OK with that.

Before I hung up, she intimated that it was over between us without ever really saying it. She's obviously leaving herself a way to come back to me that will save her face. I went along with it, of course. I'm sure she'll be asking for the D again in a week or so.