What’s with guys not liking their girl’s photos on Instagram but they like every other girls’?

Like they purposely don’t like the photos the girl (they’re either into in a serious way or dating) posts, but they like every single other photo that other girls post, and it’s not because they’re better photos. It’s like the purposely don’t like their girls’ photos? Why?
What’s with guys not liking their girl’s photos on Instagram but they like every other girls’?
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