Ive learned in life that ppl (including myself) generally have insecurities in their life that make them 'uneasy' at the thought of their significant other flirting with another person-worried that they may do things/leave them/put false hopes in the other persons mind.

And Ive dated a person that is so free spirited that it is IMPOSSIBLE to get her jelous on any level because, and she stated, "if your going to cheat/leave me, there is nothing I can do to stop you--I trust you and know that you love me, so I believe nothing would happen with flirting, etc."

Even after all of that, I still wouldnt like my partner to flirt--I guess some of my engrained insecurities will trump solid advice.

flirting is healthy and normal