bi girls- help

is it just me or do you crave having a girlfriend when you have a boyfriend and crave having a boyfriend when you have a girlfriend? i feel like i’m living up to the “greedy” stereotype. is it normal to feel like that’s what you’re missing even though you want to be exclusive with whoever you’re with? i have a boyfriend right now but i get little mini-crushes on girls and sometimes it hits me way harder than i feel like i should... i’ve cried about feeling like i need a girl to protect and hold even though i have a PERFECT boyfriend who does everything right for me and treats me like a queen. i really really do love him and want to keep him for a long long time, but is it normal to get what i call “cravings” for a girl...?