Should i over think...?

Should i over think that my boyfriend constantly checks out girls' butts while im with him, and, also, like girls' pics on Instagram of his friends or other girls that are also very attractive when i do none of those. Im very insecure and self conscious. I get really mad and give him attitude when he does. Sometimes even cry. He loves to check out girls' butts. Should i over think or not?? :(