I think for some , seeing a Lover Flirt can be very Damaging and can change that Persons feelings for what could be nothing but Harmless Flirting but if there is that niggling doubt in the Back of their Mind
it's not good and they need to be with someone who isn't an Outrageous Flirt and makes them Unhappy
Of course if they are both Naturally Flirtatious , then things can be different., some just have to accept that Flirting comes Naturally as Breathing to some of us but they have to be secure and Trust that it goes no further and that's the hard part..
MY Partner/Lover only Flirts with me
I think he knows I would break his Balls if he Flirted with other Women *smiling* and he doesn't want to or feel the need to anyway , so I guess I'm Lucky in that respect ...........guess that's what it comes down to
RESPECT .