I've noticed an overall principle with first dates. No matter how well the first date seems to go, if I end the first date with "I'd love to hang out again sometime" the girl doesn't seem to want to see me again. If I end the first date with "It was great meeting you" and just leave it there she'll be texting me the next day or even later the same day. Any thoughts on why, and how I can figure out how to get more second dates out of this phenomenon?