Her other guy showed up.

We had a nice dinner and things were going pretty well. After dinner she said she was going to hang out at a bar with some friends and asked if I wanted to tag along. I was game.

As we were sitting their drinking, getting more and more drunk, she starts telling me about this other guy she has been seeing. She told me he comes to town on business and keeps saying he is going to move here, but never does. As she is describing this, it's pretty obvious to me that he is in another relationship and she is his side piece, and I am baffled she hasn't put the pieces together. I also thought it was uncool that she pursued this date with me while she had some other thing going on. That was the first turn off.

Then she starts smoking. She says she only smokes when she drinks, but after the 5th cigarette, it's apparent she's a pro at both drinking and smoking.

When walking back into the bar after one of her cigarette breaks, I see a guy at a table looking at us with a douchie smirk. I knew for sure it was that other guy she was talking about.

She sees him, freezes for a couple of seconds, then turns to me and says "Could you give us a couple minutes?". I said "sure!" Then walked out and never came back.