I met this girl in a class last week, at the time I was super-confident and energetic and joking around non-stop with her. She was eating it up and completely into me, afterwards we went for a drink. This week I went to the same class but I had some issues on my mind and wasn't feeling that confident, and I was like kryptonite to her. I guess she could sense it right away and gravitated to the guy sitting on the other side of her who was more confident and the "class clown" this time. It just blows my mind how quickly women can lose interest if you seem insecure, even just temporarily.