Why won’t he add me on social media?

I been with my boyfriend for about a year. I met his family and some of his friends so it’s clear everyone knows we are dating. He has a Facebook and he has over 1,000+ friends on it. I tried to add him on Facebook but he declined my friend request. He was friends with my sister on his Facebook before we met and I realized he deleted her off his friends list months later of us dating. His only sibling sent him a friend request but he declined it quick. He’s friends with certain family members but won’t add certain members of his family or mine.

I post pictures of him on my Facebook but he has no pictures at all not even of himself. He doesn’t use his real first name either on his page so I’m not seeing what’s the point of his Facebook if he has no pictures and people would only know who he is from his last name. It’s the same with his Instagram. No pictures but ton of followers and following and won’t follow me back or let me follow him. I made a fake account one time and he accepted it. I saw him posting a shirtless picture of him on his story. I didn’t say anything about it though. I can’t tell if I’m being too much or if this is something I need to be concerned about. I get it’s just social media but still..

Why won’t he add me on social media?
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