thank you all for your comments. I don't want to overreact to this event, but at the same time I need to be sure that I explain to her how I feel this was disrespectful to me, harmful to the trust in our relationship and hurtful. In the 7 months we've been together I've known she has many same sex friends and family and not once to date has she been with any of them in a situation like this past weekend. She's told me she is not bi, this was like a bachelorette party and so some things went on. Maybe the only thing that happened was the hickey, but the reality is I don't know and that not knowing along with that mark on her neck is really bothering me. It's like we had a sanctity in that my body was for her alone and her's was for me alone, for that to be not the case now...visibly...albeit perhaps minimally really having a hard time with that.
Irrespective of the details, the facts are the facts as you all point out and she and I are going to have to talk more about it and I'm going to need to share what's still bothering me about what happened. I'm a big guy and I know I'm high value and there are other's in the sea so to speak, but I'm feeling hurt, betrayed and blindsided right now.