She was my really good friend from high school was visiting me at my college. I had a huge crush on her and we had been flirting a lot online and on the phone. Anyway, long story short, we had gone to a party and at the end of the night I walked in on her getting fucked by a black guys in a room upstairs. He was really big and was going all the way in, and I was at a loss of words. I felt jealous/betrayed/upset and definitely inferior.
She apologized a lot after and we even ended up making out later that night in my dorm. After the initial feelings went away I stopped being so upset and more excited/turned on and part of me was happy for her.