Opinions ?

How do y’all feel about your SO friends sending him pictures of other girls?

His friend sends him pictures on Instagram of “fit” girls and his friend will put like she’s hot as fuck and my bf just leaves him on seen? He doesn’t reply since he doesn’t really use his Instagram he just uses to like my pictures but they have each other added on snap so like .. idk I feel like they talk about it. I’ve never gone thru his phone so idk if I should ask him to see his phone ? Or should I just forget about it