help! work flirting..

I work with this kid who is cute and my age. we both have a SO and I'm in love with mine just customized my engagement ring. we fight but not fight fight more like flirting fight. I'm not flirty flirty towards him but we do sort of flirt. it probably won't go anywhere because we love our partners but I'm nervous it will...?! help plz ! what do you think?