am I petty nd stupid or tweaking

Idk if this is like something everyone feels universally... but like I genuinely can't stand when my girlfriend jokingly flirts or shit like that. But, I feel so fucking stupid when I end up being upset because shes such a sweet person nd then I feel like an even worse dick than I already am for being upset. I always feel like im the upset one in the relationship and i dont wanna be that kind of lover. we always work it out because she apologizes but she like does the same thing again with different people she knows. I know she doesn't mean it, but it drives me crazy bc im not even mad at her I'm mad at myself. feel free to be as brutal as you want i already know how mangogoans r I just wanted 2 rant so if I sound utterly stupid that's ok.