Boyfriend trouble

So my boyfriend has may single slutty girls on his snapchat and their stories consist of literally basically nudes? He gets to see this all the time and claims it's not his fault , like surely if he knew it made me insecure about him seeing basically the ins and outs of other girls bodies that we know of he would block them or something as he isn't close with them at all. I don't want to bring it up again because t sounds so so pathetic but it really stresses me out and quite frankly upset what should I do because if I talk to him about it an argument may occur ?!?