Why do some boys not like to post on social media?

Anonymous
So my boyfriend has never ever been a poster on social media. He has a post of me on his instagram and i've been on his story once. I know he doesn't mean anything by this as he post once a year max tbh. Anyways it comes to v day and he posts me on his private snapchat story- yes i appreciate he's even posted me but why couldn't that go on his main etc? I think i am just overthinking this but like what? Why doesn't he ever want to post me? I post him on my story all the time, especially when we get up to some super cute or adventurous things!
Why do some boys not like to post on social media?
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