Need advice!!!

So my boyfriend when we first got together had blocked any and all exes without asking me and I’m totally cool with because I don’t need them, I love my boyfriend. But tell me why I see his exes chat bubble on his phone... I’m so hurt and idk how to bring it up because he’s doing exactly what he prevented me from doing. Please help me because I really don’t feel comfortable with him talking to her but I don’t know how to bring it up with the possibility of me looking “crazy”