Double standards for Exes

So me and my boyfriend have been dating for a year and a couple months into the relationship he wanted me to block My ex on social media because he didn't want me to have any contact with him. But now I've seen where he snapchats multiple exes of his and he is still friends with his other exes. I haven't mentioned it to him yet but it bothers me that he has these double standards. How should I bring it up to him?