My girlfriend and I went to a party together last night at her friend's house. Shes in a sorority so has a pretty big social netowrk. We've been dating 8 months and its been great. We showed up together and everyone was drinking and having a good time. She's 5' 6" white, long sandy blond hair, nice frame and figure and thick ass. Well, an hour after we got there this black guy showed up. Apparently my gf and him knew eachother b/c he went to give her a hug. He's a typical BBC 6' 2" broad shoulders and V taper. When he hugged her it looked like he grabbed her ass a little bit. I'm not sure though. I pretended I didn't notice. I think they might have a history. He was the life of the party and i caught my gf looking over at the rest of the night. She never introduced me as her bf to him either. I asked her why she didnt' and she got defensive and brushed me off. I drove us there and had to work in the morning. We were supposed to go home around 12. When 12 rolled around she said she was just going to stay the night at her friends. Its afternoon and she normally has texted me by now. not sure how i should proceed. can i reverse the damamge?