My girlfriend thinks it's ok to sleep in the same bed as her guy friends, am I wrong for not being ok with it?

ian4nc
Some background, my girlfriend is 19 and I'm 22. I've been with my girlfriend for almost 8 months now and it's honestly been the best time of my life. We've had our highs and lows, but we always seem to work through our issues. Until recently that is. The other night my girlfriend, her female roommate, and my GF's "close friend" slept in the same bed together. She told me laughing because she thought it was amusing that they all were drunk and just passed out. I told her I was not comfortable with her sleeping in the same bed as another man, period. I finally let it go because her friend was in the same bed etc. My girlfriend then proceeded to tell me even if it was just her and another guy I should be ok with it. I made it very clear that I would not be and that I would not tolerate it. We argued intensely and she basically told me that she's always slept in the same bed as her guy friends, and that I would simply have to get over it. Then, yesterday, she tells me that Saturday night she, her same female room mate, and the same guy friend went to a party. At the end of the night the three returned to my GF's house and went to sleep. This time the female room mate slept in her own bed and my girlfriend and her close guy friend slept together by themselves. I took this as a complete slap to the face since it was only days after we had argued about it. My question, am I wrong for feeling this way? I turned the tables and asked how she would feel and she responded that she would not mind. I'm firm in my belief that no other man should be in my GF's bed, to open one's self to situations that lend themselves to suspicion shows me that she does not respect my feelings. Thoughts?
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Updates
+1 y
To be more specific, this guy is also her coworker who she's only known for 3 months, it's not like they're childhood friends or anything to that extent. I just find it hard to believe you can be that "close" with someone in that short of time.
Updates
+1 y
Thanks everybody for giving me your opinions and advice; I listened and told her if it happened again we were done, and I wouldn't put up with it etc. She immediately apologized repeatedly and said it would never happened again, I guess we'll see. Thanks everybody!
My girlfriend thinks it's ok to sleep in the same bed as her guy friends, am I wrong for not being ok with it?
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