In the midst of a night of drinking and dancing at the club is not the most appropriate time to part ways with your girlfriend. A conversation that may last a few minutes in a quiet setting will be prolonged in the club. First of all, it's loud in there, so not likely she'll be able to make out what you're saying. Secondly, amid a sizable crowd, it wouldn't take much for her to start a riot on the middle of the dance floor. Bystanders may think she's invented a new dance move, but your friends will know better.