I think I was set up or was I just wrong in this situation?

I went out last night and after all my experiences at clubs, parties, fraternity things, etc, I've learned to just have a good time and let women come to me, and they usually do. It’s almost like they like the chase but if I try to pursue it doesn’t always work. Some girl pulled something I found weird last night. I’m dancing having good time and I guess I just felt her presence so I look at her and I assume she’s trying to get around me. I make room and motion a clear path for her. She doesn’t take it but instead starts dancing towards me. I’m like okay guess we’re doing this but then I notice she’s actually really pretty. Probably the hottest girl I’ve ever dealt with. We’re holding eachother dancing and normally I’d start a conversation but I notice she just keeps getting closer to my face (also goodness trying to have a conversation right by the music is nearly impossible) Eventually our faces touch almost like we were supposed to kiss. Our lips are right next to eachother so I go for it. We kiss for 3 seconds she pulls back and shakes her head so I’m like okay “what’s your name?” She’s like “don’t worry about it” and walks away. WTF? I know I’m wrong for kissing her but I felt set up. She was smiling about the situation. I’m assuming she was eyeing me prior but i wasn’t checking for her. She came to me, got physical with me, got in my face, so to me it was the natural next step. Is that something girls do and if so what’s the reasoning behind it?

I think I was set up or was I just wrong in this situation?
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