I went on a date with a girl. Picked her up, went to see Capt. America (which was awesome by the way) then went back to my place for drinks. We watched another movie and ended up making out. She stayed over night. When I dropped her off in the morning, she excited said "Text me!" as she was walking away from the car.

I tried to set up another date for the next weekend. She doesn't text very responsively, but going with the assertive mindset I just said "We are going to hang out, I'll pick you up at 7:30 on Friday." Radio silence until one hour before I was supposed to get her and she say she can't and she's been "really busy."

So I know she's not interested now, but why? I feel like I did everything well - assertive attitude, I didn't text except to make plans, I was physically assertive (touching her and things like that) and we had a great time. So what did I fuck up?