We asked: "Why do guys ask for your digits but don't call?"

He said: Guys take down a girl's number even if they aren't going to call because they don't want to seem rude if they were talking to the girl the whole night. Also, if a guy isn't feeling a girl, then getting her number could be a way to finish up a conversation quickly, without coming off as a jerk. After getting her number, he could just tell the girl that he will call her later, and then leave.