Why are Geminis stereotyped as the "Cheaters" of the zodiac?

Like I always say if you don't believe in astrology I respect your beliefs but I don't need your witty and cynical comments. I am a proud Gemini May 23rd. Wooh Wooh ! I am tired of the constant stereotypes that we are ALL cheaters. Let me tell you something about us, we are very open and verbal if we don't like something or if we are not getting pleased (Hint Hint) we will tell you if you don't fix it we would rather leave. We are not selfish "Cough" (Sagittarius Leo Aries) lol jk. I mean Gemini's do flirt and sometimes we may take it a little over board but all of us are not cheaters. I've never cheated personally. So why do we get this stereotype?