Bf likes other girls photos?

I personally don’t like scrolling on my instagram and seeing that my bf liked some chicks photo. I understand that my generation is very social and not liking other people’s pics is almost impossible to do. I have liked other guys pics but if he didn’t want me to do that I’d stop. I mainly only like other guys photos cause I know he likes other girls photos. Fair is fair right? I’ve talked to him about it but he never stopped liking the pics. My bf hates when I post pics that r revealing so I don’t. Cause I care about the way he feels. Yet he still likes other girls revealing pics. (I’m 16 and hes 18 btw). What do u ladies think about ur Bf liking other girls pics?