WWhy he keeps me out of his social media?

This guy and I had great chemistry when we met. We made out a lot but we didn't go all the way the day we met. He asked me to add him on facebook and then I found out he was dating another girl (I believe they're on again off again kinda thing). He kept asking me to go see him where he lives, but I told him I couldn't since he had a girlfriend. Months later he told me they weren't together anymore, which was true. So we met again and we ended up having sex. He always begs me to come see him. But why he blocked me to see his pictures on facebook and instagram? He has plenty of random hot girls that are not blocked but I am. He doesn't need to hide anything from me since we're just casual.

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Can anyone help me?
WWhy he keeps me out of his social media?
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