My boyfriend likes pictures of other girls on social media?

My boyfriend and I have been dating for about a month and I notice sometimes on Instagram the only pics he 'likes' are of girls. Most of them are in minimal clothing and in sexy poses. I feel like I'm overreacting because it's just a picture but it hurts me a lot. :( Should I not say anything or bring it up? And if I should say something what do I say without seeming kinda stalkerish? Thanks.
My boyfriend likes pictures of other girls on social media?
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