Have you ever wondered, "Why do we flirt?" Flirting is a fun activity, but when your boyfriend or girlfriend flirts with someone else, that can hurt. So why do people. There are many reasons why people flirts, its totally depend upon what they seeking from an another person. Some basic reasons for flirting are as follows, 1. Imagine this scene: two people walk into a room and immediately notice each other (cue the romantic music). They hesitantly take a few steps.