Why is he doing this?! Any theories would help :)?

[Captrix]

I like this guy and he's a family friend and I followed him on Instagram, which I hope isn't weird because we don't go to the same school.
Anyway after a few days he followed me back then unfollowed me a few days later. He has done this four or five times since then. What the heck? It's all spread out though with a few weeks in between these. I know he's not big on social media at all and I almost never post but still. It's a little aggravating. Also regardless of if he has feelings for me or not we are pretty good friends and have known each other for years although I don't see him much.

Do you think maybe he's just shy for some reason? I haven't contacted him on it at all so it's not like I'm annoying him. As far as I know im the only person he does this to.