bf snapping girls

I’m a senior in hs and my bf is a freshman at ua. I trust him with everything and with that i don’t trust anyone else. His whole bsf list on snap is girls and although i’m number 1 and his dad is number 2, i just don’t understand even having streaks with other girls. Every time i bring it up it’s just an argument about how it’s just streaks. Also, whenever his frat is added to a snap of another sorority, he adds all of the girls back. I highly highly doubt any girl in his phone knows he has a gf. I don’t want girls getting the wrong idea of him adding them back/ having a streak with him. As a girl, I know how delusional girls can get and I would just feel so sick to see that happen. I obv don’t want to breakup with him over this but it’s just like so confusing bc it is literally just snap why do u need to have streaks with people u don’t rly talk to like if anything that is a chore to keep up with. What do u think?