Well, he went to high school with her and had reconnected on FB. I knew that he's done that with many past friends, as have I. I'm not a jealous person and I trusted him, so I really didn't care. He said that there were no conversations about hooking up or any thing prior to his traveling. He ran into her at a bar while hanging out with friends one night. He had been drinking. He didn't sleep with her that night tho. He ran into her at the same bar on another night and I guess that's when it happened. She is still listed as a friend on his FB. He wouldn't tell me her name because he didn't want me to pester her on FB. (I wouldn't do that anyway. I'm mad at him, I don't care about her.) So I've confronted him about protecting her and he said that's not what he was doing, but I still see it that way. I do know her name now though through a series of events.