Well, what you did was wrong. There is no denying that. As for damage control, I think you should come clean to your roommates' fiancee. You know better than any of us here what kind of person she is. Maybe she is OK with it,if she is an open, accepting individual tolerant of "alternative" lifestyles. Maybe she is sharpening her pitchfork as you read this, ready to spill the beans to everyone about what you did. One thing you need to do is talk to someone, whether it be your gf, roommate or his fiancee. If I was in your position I would at least put it out there before you are confronted and it gets worse. She knows, and she IS thinking about it. The longer you wait, the worse it will be. I'll give you some very good advice that I learned a long time ago. "Without any information, people will always think the worst". Myself or anybody here that doesn't know the people involved cannot tell you what they are thinking. You need to tell them the truth so THAT is what they are thinking. If you are going to talk to your roommates fiancee first, maybe you can hand her a healthy VS gift card to break the ice. Then APOLOGIZE profusely and try to get her to understand why you did it. If your lucky and she hasn't told anyone else, she might be understanding and go easy on you. If she did tell "everyone" then your cover is blown and then you have a LOT of problems to deal with. I do not envy your position at all. Good Luck, your gonna need it and then some.