My Slut Gf

So I wound up at a friends bachelor party one weekend, all was good and fun strippers were unreal and had few limits the night was going great until the end when my gf and a few other friends showed up. A little awkward at first until the strippers left but then things got weird. The groom to be had a huge crush on my gf and I mean I don’t blame him, standing at 5’8 115lbs long sexy legs and hips and ass to literally die for,but they seemed to be getting awfully flirty. Until I realized they had gone upstairs. I went to check on her when I walked in on her stripped to her thong and heels giving the groom to be a handjob. I’m not a jealous man and thought it was fun so I winked and told her hands only, no mouth or ass and I left them be. But before long I had realized half the guys had gone up to the room where my gf was. I decided to say fuck it and go to bed what happens happens. Well in the morning she told me she had given out 6 blowjobs and let the groom fuck her ass. And she was surprised when I told her we were done and called her a slut. Am I in the wrong? I’m mostly made I couldn’t join. I never realized how slutty she was. Not sure how to feel about it