Why do you think my girlfriend won't share post with me on her social media?

We have been together for a few months, almost a year. Both of our families know about our relationship. Almost all of my photos are with her, but my girlfriend doesn't share anything with me. She doesn't even share snaps. This sometimes makes me suspicious and I start to think she is cheating on me.

Why do you think my girlfriend won't share post with me on her social media?
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